1846
Wilmot Proviso attempts to ban slavery in the West

1848
Mexican War ends

Free-Soil Party forms

Zachary Taylor elected president

1849
California and Utah request admittance to the Union

1850
Compromise of 1850

Congress passes Fugitive Slave Act

Zachary Taylor dies; Millard Fillmore becomes president

1852
Harriet Beecher Stowe publishes Uncle Tom’s Cabin

Franklin Pierce elected president

1853
Gadsden Purchase negotiated

1854
Ostend Manifesto exposed

Congress passes Kansas-Nebraska Act

Republican Party forms

1855
William Walker invades Nicaragua

1856
Border ruffians burn the town of Lawrence, Kansas

Pottawatomie Massacre

Charles Sumner attacked in the Senate

James Buchanan elected president

1857
Supreme Court issues Dred Scott v. Sanford decision

Buchanan accepts Lecompton Constitution

Panic of 1857

1858
Congress rejects Lecompton Constitution

Abraham Lincoln and Stephen Douglas debate slavery in Illinois

1859
John Brown raids Harpers Ferry, Virginia

1860
Abraham Lincoln elected president

South Carolina secedes from the Union

1861
Alabama, Florida, Georgia, Louisiana, Mississippi, and Texas secede

Jefferson Davis becomes president of the Confederate States of America 

Lincoln delivers first inaugural address

South Carolina seizes Fort Sumter

Arkansas, North Carolina, Tennessee, and Virginia secede

Congress passes Morrill Tariff

Lincoln suspends writ of habeas corpus

Trent Affair occurs

Confederacy defeats Union at First Battle of Bull Run

1862
Congress passes Legal Tender Act, Homestead Act, and Morrill Land Grant Act

Confederacy passes Conscription Act

U.S. Congress passes Confiscation Act

Union defeats Confederacy at Shiloh and Antietam

1863
Congress passes National Banking Act

Drafts initiated in the North

Draft riots in New York City

France invades Mexico

Bread riots in Richmond, Virginia

Lincoln issues Emancipation Proclamation

Union defeats Confederacy at Gettysburg and Vicksburg

Lincoln delivers Gettysburg Address

1864
Ulysses S. Grant takes command of Union troops

Lincoln is reelected

General Sherman begins March to the Sea

1865
Davis proposes Hampton Roads peace conference

Robert E. Lee surrenders to Grant at Appomattox Courthouse