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The War of Independence (1775–1783) ends, and the U.S. acquires the first 13 colonies in the east by the Treaty of Paris that establishes the first U.S. boundaries
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The Louisiana Purchase of land from France extends US lands from the Mississippi River to the Rocky Mountains between the Canadian border and the Gulf of Mexico
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The Lewis and Clark Expedition explores and map the US lands bought in the 1803 Louisiana Purchase
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The War of 1812 resulted in the people of America thinking of itself as a unified and strong nation increasing the urge for Westward Expansion
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The economic plan introduced by Henry Clay, called the American System, was aimed at creating a subsidized transportation infrastructure of new roads and canals
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The Florida Treaty, aka the Adams Onis Treaty, set the boundary between the US and New Spain (now Mexico)
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Between 1830 to 1840 the forced migration included the terrible journey of the Creek nation on the infamous Trail of Tears
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The Mexican American War begins, also known as the Invasion of Mexico
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The Gadsden Purchase acquires territory in Arizona and New Mexico
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The short lived Pony Express was established as the most direct means of east–west communication before the telegraph was established
