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The Louisiana purchase was in 1803-and its key events were starting off with the failure of France to put a slave revolution in Haiti, this continued on to the war with Great Britain and the British naval blockade with France that was combined with French economic difficulties, this may have convinced Napolean to offer Louisiana for sale for the united states. These events lead up to the civil war because they were the first to start off how Americas territory was made to lead to its great history.

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The lewis and clark expedition was an expedition that was called Corps of discovery, Lewis was the leading commander of the expedition and Clark was the governor of the missouri territory. They were leading this expedition essentially to find a waterway from the mississippi to the pacific wich they failed to do but they did succeed in documenting more then 100 animals, and 178 new plants as well as 140 maps for the region. This led up to the civil war because they had gained relations with the Native americans and they had gained so much knowledge of the territory that they kept finding out about america.

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The indian removal act was when Congress passed a law to move Native Americans from the Southeast to the west of the Mississippi River. This had become known as the Trail of Tears,Native americans opposed of leaving their land which resulted in many battles with local white settlers, This lead up to the civil war because this is one of the first events that show the split in the American lands.

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This was the early stages of Texas' war for independence from Mexico, a group of Texan volunteers led by George Collinsworth and Benjamin Milam overwhelmed the Mexican garrison at the Alamo and captured the fort, seizing control of San Antonio. This led to the civil war because it was continuing its quartermasters depot to supplying southern forces.

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The oregon trail was when people stated traveling west by wagon train, they were looking to settle in more land and expand, they wanted to achieve what politicians of the day called its “Manifest Destiny” to reach “from sea to shining sea.” It effected America and led up to the civil war by expanding the united states creating more of a North,East,South,West territory.

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The Journalist, John O'Sullivan introduced the term Manifest Destiney to describe westward expansion of the United States. This changed the perspective of the united states and how things would be handled. This led up to the civil war by the rapid expansion of the United States intensified the issue of slavery as new states were added to the Union.

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texas officially becomes a state it entered a treaty of annexation with the united states, it was a key event in the 19th century because it was broadening the in the United States over the issue of slavery and setting off the Mexican-American War. It was relevant to the civil war because  Texas was admitted to the United States a slave state. The annexation of Texas contributed to the coming of the Mexican-American War.

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The mexican-american war was fought for the rights to texas, after the war mexico paid 15 million to the united states, it also became california and other states, its key events were the fact that there was so much loss of life, economic ruin, and a huge damage to property.it led to the civil war by creating more sectional strife over the expansion of slavery.

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England signs the Oregon Treaty handing over the Oregon Territory to the United States.The Oregon Treaty set the border between the U.S. and British North America at the 49th parallel The two British colonies were amalgamated in 1866 as the United Colonies of Vancouver Island and British Columbia.

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James marshall discovered gold at stutters mill, the word gets out and now california is on the strike for wealthyness. it ontributed to the civil war by the state recruiting volunteer soldiers so that regular soldiers could leave the western territories for the battlefields of the East.

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California officially becomes a state after a treaty and being ceded with America by Mexico, it was relevant to the 19th century because after the gold rush the population had raised in California and it was needed to have a civil government and Californians needed statehood after heated debate in the U.S. Congress arising out of the slavery issue. It was relevant to the civil war it played a valuable financial role as much of the Union government's funding was supported by gold from California's Sierra Nevada mountains.

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the pony express was a mail service delivering messages, newspapers, and mail using horse-mounted riders that worked from April 3, 1860, to October 26, 1861, between Missouri and California in the United States of America.Its significance to the civil war The route that was created served as an important line of communication at the beginning of the Civil War, but it is soon made obsolete by the opening of the Pacific Telegraph line.