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FrançaisAP US History Unit 5: Period 5, 1844–1877
In a single generation, the United States stretched its border to the Pacific, fractured into two warring nations, killed three quarters of a million of its own soldiers, abolished slavery, and then walked away from the project of multiracial democracy it had just begun. The collisions of Period 5 produced the constitutional, demographic, and economic order from which every subsequent chapter of American history would be argued.
The 12 lessons in order
Contextualizing Period 5
The opening lesson. Frames the years from 1844 to 1877 as one connected arc and previews the expansion, sectional crisis, war, and reconstruction that drive the next eleven lessons.
Manifest Destiny
The doctrine that named an era. Polk's election, the annexation of Texas, the Oregon Treaty, the Mormon trek to Utah, and the political and religious migrations that carried American settlers to the Pacific.
The Mexican-American War
Polk's war message, the campaigns of Taylor and Scott, the Treaty of Guadalupe Hidalgo, and the Mexican Cession that added more than 500,000 square miles and reopened the question of slavery in the territories.
The Compromise of 1850
Henry Clay's last great deal: California as a free state, Utah and New Mexico under popular sovereignty, and the Fugitive Slave Act that turned every Northern street into a sectional battleground.
Sectional Conflict: Regional Differences
Free labor versus slave labor as competing economic systems, abolitionist organizing, and the proslavery argument. The only Unit 5 lesson the CED assigns two Thematic Focus blocks and two Learning Objectives.
Failure of Compromise
The Kansas-Nebraska Act repeals the Missouri Compromise line, Bleeding Kansas turns popular sovereignty into civil war in miniature, and the Dred Scott decision shuts down every remaining political escape route.
Election of 1860 and Secession
Lincoln wins on a free-soil platform without a single Southern electoral vote. South Carolina secedes within six weeks, six other slave states follow, and the Confederate States of America is born at Montgomery.
Military Conflict in the Civil War
From Fort Sumter to Appomattox: Confederate strategy and the cordon defense, Union strategy and the Anaconda Plan, the turning points at Antietam, Gettysburg, and Vicksburg, and the total-war campaigns of Sherman and Grant.
Government Policies During the Civil War
The Emancipation Proclamation, the Gettysburg Address, suspension of habeas corpus, conscription, the Homestead Act, the Pacific Railway Act, and the wartime expansion of federal authority that transformed the American state.
Reconstruction
Presidential and Radical Reconstruction, the Reconstruction amendments, the Freedmen's Bureau, the integrated state legislatures of the postwar South, and the women's rights movement's response to the Fourteenth and Fifteenth Amendments.
Failure of Reconstruction
White paramilitary terror, the narrowing of the Reconstruction amendments by the Supreme Court, the Compromise of 1877, the rise of sharecropping, and the long road that ended in Jim Crow segregation.
Comparison in Period 5
The closing lesson. Synthesis essay, full-period DBQ practice, and a graphic comparison of the United States in 1844 with the constitutional and economic order that had taken shape by the end of Reconstruction.