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The Texas annexation was the 1845 incorporation of the Republic of Texas into the United States of America, which was admitted to the Union as the 28th state on December 29, 1845. This was when Texas left Mexico they became independent and then the joined the United States to be the 28th state added.

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The Louisiana Purchase was  a land deal between the United states and France. The Louisiana territory included land from fifteen present U.S states and two Canadian territories.  Jefferson took up the banner and threatened an alliance with Britain, although relations were uneasy in that direction. This event occurred in New Orleans.

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The Oregon Trail stretched from Independence, Missouri, to Oregon City, Oregon. It started in 1836 by two Methodist missionaries named Marcus and Narcissa Whitman. They  drove their wagon as far as Fort Boise,  they proved that wagons could travel on the Oregon Trail. many pioneers migrated west on the Oregon Trail. Some bought "prairie schooners," wooden-wheeled wagons covered with sailcloth and pulled by oxen. Most walked, however, pushing handcarts loaded with a few precious possessions, food, and other supplies. The trip took months, even if all went well.

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The Indian removal act was signed into law by President Andrew Jackson on May 28, 1830,
authorizing the president to grant unsettled lands west of the Mississippi in exchange for Indian lands within existing state borders. A few tribes went peacefully, but many resisted the relocation policy.

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The California Gold Rush was from 1848-1855. It started when James Marshall at Sutter's Mills discovered few shiny particles . The news of the gold began to spread The gold seeker were refereed to as "Forty-Niners."

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March 3rd 1820
The Missouri Compromise was a United States federal statute devised by Henry Clay.This was the split between the U.S. states. The states divided because of slavery. The north side of the states didn't want slavery but the south did. The way that they separated the states by prohibiting the practice in the former Louisiana Territory north of the parallel 36°30′ north, except within the boundaries of the proposed state of Missouri. This would be the border between the north and south.

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This expedition was one of the first one to cross what is now know as the western part of the United States. This was taken place in May 1804. Lewis and Clark traveled from St. Louis to the pacific coast. It was a two year journey.

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Mexican American War
A revolution between Mexican-American wars on the invasion of mexico lead for armed forces to fight back for territory.The war begun on 1846 and lasted 2 years ending approximately around 1848.The war was taken place in Texas which Mexico considered as part of their territory. The US agreed to pay $15 million to pay the physical damage of war. In addition, the United States assumed $3.25 million of debt owed by the Mexican government to US citizens. Mexico recognized the loss of Texas and thereafter cited the Rio Grande as its national border with the United States.Therefore,Mexico enters "a period of self-examination".