Learning Objectives
By the end of this lesson, students will be able to:
- Account for how the Land Ordinance of 1785 and the Northwest Ordinance of 1787 set the legal framework that organized westward settlement and the admission of new states.
- Describe the principal migration streams of the early Republic, including New Englanders into upstate New York and the Western Reserve, Pennsylvania Germans south through the Shenandoah Valley, and Virginians and Carolinians into Kentucky and Tennessee.
- Account for the conflict between settlers and the confederated American Indian nations of the Ohio Country, from St. Clair's defeat in 1791 to the Battle of Fallen Timbers in 1794 and the Treaty of Greenville in 1795.
- Describe the forced movement of enslaved people through the internal slave trade and the displacement of American Indian nations west of the federal boundary line.
- Use evidence from the first two federal censuses to compare population growth and regional distribution between 1790 and 1800.
Key Concepts
The Treaty of Paris of 1783 doubled the territory of the United States overnight, granting the new nation everything east of the Mississippi River and south of the Great Lakes. Almost no part of that territory was unoccupied. American Indian nations, French traders, British garrisons that had not yet evacuated their posts, and a thin scatter of colonial settlers were already on the ground. The early Republic spent the next seventeen years trying to settle the question of who would actually possess the land that the treaty had given the new federal government on paper.
The Confederation Congress wrote the legal framework first. The Land Ordinance of 1785 imposed a rectangular survey system on the territory north of the Ohio River. It divided the land into six-mile-square townships, each subdivided into thirty-six one-mile-square sections of 640 acres, with one section in every township reserved for the support of public schools. The system was simple, sellable, and abstract. It treated the land as a grid that existed independently of any of the people, plants, or earlier histories that already inhabited it (KC-3.3.I.C).
Two years later, the Northwest Ordinance of 1787 turned that grid into a political project. The ordinance organized the lands north of the Ohio River as the Northwest Territory and laid out a three-stage path from territorial status to statehood. A territory with five thousand free adult males could elect a legislature; a territory with sixty thousand free inhabitants could draft a constitution and apply for admission to the union on equal footing with the original thirteen states. The ordinance also guaranteed jury trials, religious freedom, and public education to settlers, and it prohibited slavery within the entire territory. It is often called the most important law passed under the Articles of Confederation, and it set the template that would eventually carry the United States to the Pacific (KC-3.3.I.C).
The migration streams that filled the Northwest Territory and the trans-Appalachian South were not random. New Englanders, organized through land companies such as the Connecticut Land Company, moved west into upstate New York and into the Western Reserve of northeastern Ohio, carrying their town-meeting habits, their Congregational churches, and their stone-walled fields with them. Pennsylvania German farmers and Scots-Irish settlers moved south down the Great Wagon Road through the Shenandoah Valley into the Carolina backcountry. Virginians and North Carolinians crossed the Cumberland Gap into Kentucky and Tennessee, where Daniel Boone's Wilderness Road had already cut a path. Free African Americans, freed in increasing numbers by the gradual-emancipation laws that the northern states passed in the 1780s and 1790s, migrated north out of the upper South toward Philadelphia, New York, and Boston, where free Black communities were building churches and mutual-aid societies.
None of this movement happened on empty land. The confederated American Indian nations of the Ohio Country, including the Shawnee, Miami, Lenape (Delaware), Wyandot, and Ottawa, refused to recognize the boundary lines that the federal government had drawn through their territory in the 1780s. In November 1791, a confederated force led by the Miami chief Little Turtle and the Shawnee chief Blue Jacket destroyed an army of roughly 1,400 men under Major General Arthur St. Clair near the Wabash River. St. Clair's defeat remains the largest battlefield loss the United States Army has ever suffered to American Indian forces, and it forced the Washington administration to take the Northwest Indian War seriously (KC-3.3.I.A).
Three years later, a reorganized federal force under General Anthony Wayne won the Battle of Fallen Timbers on August 20, 1794, at a stretch of the Maumee River where a tornado had recently flattened a stand of trees. The British garrison at nearby Fort Miamis declined to shelter the retreating American Indian fighters, and the confederation collapsed. The Treaty of Greenville, signed in August 1795, ceded most of present-day Ohio and a slice of Indiana to the federal government and pushed the boundary of American Indian sovereignty to a line running from the Cuyahoga River south and west to the mouth of the Kentucky River. The treaty opened the eastern Northwest Territory to large-scale settlement and turned Ohio, admitted in 1803, into the first state carved out of the new system (KC-3.3.I.A).
The forced movement of enslaved people followed a different logic. With the closing of new African slave imports approaching in 1808, planters in the Chesapeake region, where soil exhaustion was driving a shift from tobacco to wheat, increasingly sold enslaved laborers south and west into Kentucky, Tennessee, and the new Mississippi Territory organized in 1798. The internal slave trade moved people in coffles down dirt roads and on flatboats; it would expand massively in Period 4 but its earliest patterns took shape in the 1790s. The same federal government that banned slavery north of the Ohio River by ordinance also wrote the Fugitive Slave Act of 1793, which obligated officials in free states to return enslaved people who had escaped from slave states.
Three new states tested the federal framework. Vermont, admitted in 1791, settled a long-standing dispute over the New Hampshire grants and became the fourteenth state. Kentucky followed in 1792, carved out of western Virginia and growing past 220,000 residents by the 1800 census. Tennessee, admitted in 1796 from the territory south of the Ohio River, was the first state created from a federal territory under the Northwest Ordinance pattern. Vermont and Kentucky were free states from the start; Tennessee permitted slavery from its constitution forward. The pattern of admitting one free and one slave state in rough succession, which would dominate the politics of Period 4, was already taking shape.
Coastal cities grew at the same time. Philadelphia, the federal capital from 1790 to 1800, passed 60,000 residents and became the publishing, financial, and political center of the Republic. New York overtook it in the 1790s, helped by a deep Atlantic harbor and the lower Hudson trade. Boston, Baltimore, and Charleston rounded out the seaboard commercial network. Improved turnpikes (the Lancaster Turnpike of 1794 was the first major chartered toll road) and an expanding federal post road network, organized by the Post Office Act of 1792, connected the seaboard cities to one another and, slowly, to the trans-Appalachian settlements. The infrastructure was thin by twenty-first-century standards, but the political work of keeping a federal Republic together at a continental scale began here (KC-3.3.I.B).
By 1800, the demographic shape of the new nation had shifted. The first federal census in 1790 had counted 3.9 million people; the second census in 1800 counted 5.3 million, a gain of nearly 36 percent in a single decade. The trans-Appalachian states held more than 600,000 of those new residents. The free Black population had grown from roughly 60,000 to more than 100,000, concentrated in the northern states and the upper South. The enslaved population had grown from 700,000 to nearly 900,000, concentrated more tightly than ever in the South. The early Republic was not only larger than it had been at the moment of independence; it was distributed differently, and the regional differences that the next sixty years of American politics would struggle to manage were already legible on the census tables.
| Region | 1790 | 1800 | Change |
|---|---|---|---|
| New England | 1,009,000 | 1,233,000 | +22% |
| Middle States (NY, NJ, PA, DE) | 958,000 | 1,403,000 | +46% |
| Southern Atlantic States | 1,852,000 | 2,286,000 | +23% |
| Trans-Appalachian (KY, TN, OH territory) | 109,000 | 386,000 | +254% |
| National total | 3,929,000 | 5,308,000 | +35% |
Primary Source Excerpts
Five sources sample the legal framework, the violent contest over land, the patterns of settlement, and the demographic record of the early Republic.
The Northwest Ordinance, Article VI
"There shall be neither slavery nor involuntary servitude in the said territory, otherwise than in the punishment of crimes whereof the party shall have been duly convicted: Provided, always, That any person escaping into the same, from whom labor or service is lawfully claimed in any one of the original States, such fugitive may be lawfully reclaimed and conveyed to the person claiming his or her labor or service as aforesaid."
Article VI of the Northwest Ordinance is the most-cited single sentence in the document. It prohibited slavery within the Northwest Territory and so established the Ohio River as the line that would separate free territory from slave territory for the next seventy-five years. The clause that follows it, however, required free-state officials to return escaped enslaved people to their claimants in the original states. The Ordinance simultaneously announced free soil and bound the federal government to enforce slavery across that soil's borders.
Confederation Congress, "An Ordinance for the Government of the Territory of the United States, North-West of the River Ohio," July 13, 1787. Avalon Project at Yale Law School. View at the Avalon Project →Treaty of Greenville, Article III (Boundary Line)
"The general boundary line between the lands of the United States and the lands of the said Indian tribes, shall begin at the mouth of Cayahoga river, and run thence up the same to the portage between that and the Tuscarawas branch of the Muskingum; thence down that branch to the crossing place above Fort Lawrence… thence westwardly to a fork of that branch of the Great Miami river running into the Ohio."
Article III of the Treaty of Greenville drew a line across the future state of Ohio. South and east of the line was federal land, opened to settlement; north and west of the line was, in principle, American Indian sovereignty. The boundary lasted only as long as it took the next round of settler pressure to render it untenable. Tecumseh, who had refused to sign at Greenville, would spend the next fifteen years building a new pan-tribal confederation against the line the treaty had drawn.
Treaty Between the United States of America and the Tribes of Indians, Greenville, August 3, 1795. Avalon Project at Yale Law School. View at the Avalon Project →Map of the United States and Territories, 1796
Late-1790s mapmakers showed the political logic of the early Republic on a single sheet. Coastal states appeared in the irregular metes-and-bounds shapes inherited from colonial charters; the Northwest Territory appeared as a perfect grid; the Greenville Treaty Line cut a diagonal across the grid; and "Indian Country" was labeled as a single bounded region beyond it. The map made dispossession look like geometry.
Mathew Carey, A General Atlas for the Present War (Philadelphia, 1796). Library of Congress digital ID: 74693215. View at Library of Congress →Little Turtle, Address at Fort Greenville
"I hope you will pay attention to what I now say to you. I wish to inform you where your younger brothers, the Miamies, live, and, also, the Pottawatimies of St. Joseph's, together with the Wabash Indians… the prints of my ancestors' houses are everywhere to be seen within these boundaries."
The Miami leader Little Turtle, who had commanded the confederated force that destroyed St. Clair's army four years earlier, reminded the American negotiators at Greenville that the territory they were claiming had been continuously inhabited and governed by the nations they were now requiring to sign. The speech was recorded in the council minutes and stands as a primary-source counterweight to the legal text of the treaty itself.
Little Turtle (Mihsihkinaahkwa), Address to the Greenville Council, July 22, 1795, in American State Papers, Indian Affairs, Vol. 1. View at the Library of Congress →The First Federal Census, 1790
The first federal census, mandated by Article I, Section 2 of the Constitution and conducted by United States marshals between August 1790 and the spring of 1791, counted the population of every state and the territory south of the Ohio River. It enumerated free white males over and under the age of sixteen, free white females, all other free persons, and enslaved persons. The published returns reveal a population of 3,929,214, of whom roughly 700,000 were enslaved and just over 60,000 were free Black residents. The 1790 figures became the baseline against which every later claim about the demographic effect of westward movement was measured.
U.S. Census Bureau, Heads of Families at the First Census of the United States Taken in the Year 1790. Government Printing Office, 1909. View at the Census Bureau →Discussion Questions
- (Causation) Account for the conditions that allowed the Northwest Ordinance to ban slavery within the Northwest Territory in 1787, when no comparable ban was politically possible at the Constitutional Convention that same summer. What made the territorial setting different from the federal one?
- (Comparison) Compare the federal government's posture toward American Indian nations in 1783 (Treaty of Paris) with its posture in 1795 (Treaty of Greenville). What had changed about the federal approach to American Indian sovereignty, and what had stayed the same?
- (Continuity and Change) Examine the migration patterns of free Black Americans, enslaved Black Americans, and white settlers between 1783 and 1800. In what ways did movement open new possibilities for each group, and in what ways did it impose new constraints?
- (Causation) The rectangular survey system imposed by the Land Ordinance of 1785 is sometimes described as the most consequential law most Americans have never heard of. Account for that claim. What did the survey grid make possible, and what did it foreclose?
- (Comparison) Compare urban growth on the seaboard (Philadelphia, New York, Boston) with rural growth in the trans-Appalachian states (Kentucky, Tennessee). Which kind of growth had a greater effect on the political life of the early Republic, and why?
Classroom Activities
Reading the Survey Grid
Project the 1796 Carey map alongside a present-day satellite image of central Ohio. Students mark the surviving rectangular section lines on the modern image. The class then discusses what the persistence of the eighteenth-century survey grid in the twenty-first-century landscape can tell historians about the durability of the Land Ordinance.
Two Maps, One Treaty
Divide students into pairs. Each pair receives a copy of Article III of the Treaty of Greenville and a blank outline map of the Old Northwest. Students plot the treaty boundary using the river names in the article, then label the lands ceded by the confederated nations and the lands reserved to them. The activity ends with a one-paragraph claim about whose perspective the boundary line reflects.
Census Inference
Distribute the trans-Appalachian rows from the 1790 and 1800 census tables in this lesson. Students calculate percentage growth for Kentucky, Tennessee, and the Northwest Territory, then write a one-sentence inference about which migration stream the growth most likely reflects (Virginian, Carolinian, or New England). The class compares answers and identifies the evidence each inference rests on.
Two Voices at Greenville
Distribute Little Turtle's address and the text of Article III of the treaty. Students complete a two-column organizer (claims, evidence, audience, purpose) for each source. They finish by writing a short paragraph that uses both sources to assess whether the Treaty of Greenville should be read as a negotiated settlement or as a forced cession.
Vocabulary
Standards Alignment
Draft alignment — pending educator review. AP USH codes correspond to the official College Board Course and Exam Description (Effective Fall 2023, Version 1). Statements below are paraphrased in the CountryReports voice; refer to the College Board's published CED for verbatim wording.
Themes
Historical Thinking Skill and Reasoning Process
Learning Objectives
Key Concepts
AP Practice Questions
- (A) The Battle of Saratoga and the Franco-American alliance of 1778.
- (B) The Battle of Fallen Timbers in 1794 and the Treaty of Greenville that followed.
- (C) Pinckney's Treaty of 1795 and the opening of the Mississippi River to American navigation.
- (D) Jay's Treaty of 1794 and the resolution of disputes with Great Britain over the Northwest posts.
- (E) The Whiskey Rebellion of 1794 and the federal show of force in western Pennsylvania.
Correct: (B). The diagonal line is the Greenville Treaty Line, established by the Treaty of Greenville in August 1795 after the United States victory at the Battle of Fallen Timbers a year earlier. Pinckney's Treaty (C) addressed the Mississippi and Spanish Florida; Jay's Treaty (D) addressed British posts further north (KC-3.3.I.A).
- Identify ONE specific provision of the Northwest Ordinance of 1787 and explain how it shaped settlement of the Northwest Territory.
- Explain ONE specific way in which migration into the trans-Appalachian West produced conflict between settlers and American Indian nations between 1783 and 1795.
- Explain ONE specific way in which migration patterns within the early Republic differed for free Black Americans and for enslaved Black Americans during the same period.
Scoring: 1 point per part. Strong responses to (a) name a specific provision: the three-stage path to statehood, the prohibition of slavery, the guarantee of jury trial and religious freedom, or the school-section reservation. Part (b) responses might cite St. Clair's defeat in 1791, the Battle of Fallen Timbers in 1794, or the cession of land at Greenville. Part (c) responses should contrast the gradual-emancipation-driven northern migration of free Black Americans with the forced southwestern movement of enslaved people through the internal slave trade.
The full seven-document set lives in the Unit 3 practice exam packet (Document A: Land Ordinance of 1785 excerpt; Document B: Northwest Ordinance, Article VI; Document C: Treaty of Greenville, Article III; Document D: Little Turtle's address at Fort Greenville, 1795; Document E: Anthony Wayne's letter to Knox after Fallen Timbers, 1794; Document F: 1796 Carey map of the United States and Territories; Document G: 1790 Census population summary).
Scoring framework: 1 point thesis, 1 point contextualization, up to 4 points evidence (at least 3 documents used to support the argument, plus an outside-evidence point), 1 point sourcing (point of view, purpose, situation, or audience for at least three documents), 1 point complexity. Maximum 7 points.
Scoring framework: 1 point thesis, 1 point contextualization, 2 points evidence (at least two pieces of specific historical evidence, one of which directly supports the argument), 1 point analysis using the Comparison reasoning process, 1 point complexity. Maximum 6 points.

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