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This purchase of land, doubled the size of the United States and helped citizens expand towards the western part of the United States.

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This Annexation added Texas to the United States and this annexation was made by James Polk in 1845. This was also part of the largest expansion in US History. Texas was originally part of Mexico but later on, there was a group of US settlers that declared independence. The Republic of Texas became annexed to the US 9 years later. 

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This was a war between the US and Mexico in 1846. One thing that triggered this war was the annexation of Texas. Also, a dispute over the Mexico-US border that ended with the US winning the dispute along with 500,000 square miles of Mexico's territory including many states such as California, Arizona, Utah, and more.

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The Trail of Tears was an act that removed American Indians from their territory between 1830 and 1850. Many American Indians had to move to areas with crucial weather such as the Rocky Mountains and they weren't used to it which caused many to die.

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The Underground Railroad was a network of trails that led slaves to the North and helped them become free. Harriet Tubman was an American abolitionist and activist that led the Underground Railroad. She freed as many as 70 slaves in 13 trips to Maryland.

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The Compromise of 1850 was a set a five laws that had been passed to preserve the Union. Some of these laws included allowing slavery in certain states.

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The Industrial Revolution sparked the start of processing and manufacturing in the United States. This gave many people jobs and money with the transportation of goods and manufacturing of necessities for the citizens of the states.

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The Oregon Trail is known as one of the largest migrations in US history and went from Missouri to Oregon by crossing three states in the process. As many as 300 to 400,000 people migrated on this trail from 1840-1860.

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The Missouri Compromise made Missouri a slave state and anything above the Missouri Compromise line would be considered slave free. This decided whether or not new states prohibited or allowed slavery.

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This was a bill that made the territories of Kansas and Nebraska. It also allowed the citizens of each state to decide if the state prohibited or allowed slavery. This decision making caused proslavery and antislavery activists to dispute which let to an uprising known as Bleeding Kansas.