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The Louisiana purchase
Granted the United States the sole authority to obtain the land -
12th Amendment
Each elector must cast distinct votes for president and vice president, instead of two votes for president. -
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Louis and Clark Expedition
The expedition's principal objective was to survey the Missouri and Columbia rivers, locating routes that would connect the continental interior to the Pacific Ocean. -
War of 1812
Was fought between the United States and Great Britain, primarily over the impressment of American sailors by the British Navy, as well as disagreements over trade, western expansion, and Native American policy -
Monroe Doctorine
The doctrine warns European nations that the United States would not tolerate further colonization or puppet monarchs. -
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American anti-slavery society
It was formed to make people aware of the conditions of enslaved people and to end slavery. -
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Mexican-American war
Started because of a disputed boundary between the United States and Texas on the Nueces Strip. -
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California Gold Rush
A rapid influx of fortune seekers in California that began after gold was found at Sutter's Mill -
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Woman’s suffrage movement
Supporters lectured, wrote, marched, lobbied, and practiced civil disobedience to achieve what many Americans considered a radical change in the Constitution – guaranteeing women the right to vote. -
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Civil War
The reasons for the Civil War were disagreements over slavery, states vs. federal rights, the election of Abraham Lincoln, and the economy. -
13th amendment
Abolishment of slavery