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The U.S. and Britain set the northern border of the Louisiana Purchase.
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Secretary of Sate John Quincy Adams got Spain to approved the Adams-Onis Treaty
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Mexico declares independence from Spain.
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Spain transfers Florida to the U.S.
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Texans fight the battle of Alamo. It was a turning point of war.
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"The Oregon Trail is a 2,170-mile historic East–West, large-wheeled wagon route and emigrant trail in the United States that connected the Missouri River to valleys in Oregon. "
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California gains independence and becomes the California Republic.
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Florida officially becomes a state and a slave state.
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Texas, also known as the "Lone Star State" becomes part of the United States.
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Congress declares war on Mexico.
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America wins the American-Mexican War.
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The California Gold Rush begins.