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Three fifths compromise
1787
Electoral college
1787
Louisiana purchase
1803
Kansas Nebraska act
1854
Texas Revolution
1835-36
Mexican American war
1846-1848
Mexican cession
1848 (California, New Mexico, Arizona, Nevada, Utah, and parts of Colorado and Wyoming)
Dred Scott v Sanford
1856-57
Treaty of Guadalupe Hidalgo
1848
Missouri Compromise
1820
Fugitive slave act
1850
Compromise of 1850
California free state
Southern cession
1860-61 (Texas, Arkansas, Louisiana, Tennessee, Alabama, Florida, Mississippi, SC, NC, Georgia, Virginia)
Crittenden Compromise
1860-61 Failed Amendment, prevent civil war, permanent slavery