Westward Expansion Timeline
Every event color-matches the standard it belongs to. Use this view to see how ideas, technology, and conflict connected across the early 1800s.
- 1793Std 5
Cotton Gin Invented
Eli Whitney’s machine speeds cotton cleaning and expands slavery in the South.
- 1794Std 1
Whiskey Rebellion
Washington sends troops; the new federal government proves it can enforce its laws.
- 1803Std 2
Louisiana Purchase
Jefferson buys territory from France for $15 million, doubling the size of the U.S.
- 1812–15Std 1
War of 1812
Second war with Britain; the Treaty of Ghent ends it and U.S. confidence grows.
- 1819Std 3
Adams-Onís Treaty / Florida Cession
Spain cedes Florida to the U.S. and western boundaries are set.
- 1820Std 5
Missouri Compromise
Missouri enters as a slave state, Maine as a free state; slavery banned north of 36°30′.
- 1844Std 5
Telegraph & Morse Code
Samuel Morse sends “What hath God wrought” from Washington to Baltimore, launching long-distance electric communication.
- 1846Std 4
Oregon Treaty / Donner Party
Oregon split with Britain at the 49th parallel; settlers trapped in the Sierra Nevada.
- 1846–48Std 3
Mexican-American War
War over Texas’s southern border; the U.S. occupies Mexico’s capital.
- 1848Std 4
Treaty of Guadalupe Hidalgo / Gold Rush
Treaty grants the Mexican Cession; gold is found at Sutter’s Mill.
- 1854Std 5
Kansas-Nebraska Act
Popular sovereignty replaces the Missouri Compromise line, sparking “Bleeding Kansas.”
- 1861Std 5
Civil War Begins
Confederate forces fire on Fort Sumter, opening the war that growing sectional tensions over slavery and expansion had been building toward.