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The US purchased the Louisana Territory to expand their territory. http://geography.about.com/od/historyofgeography/a/louisianapurcha.htm
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The Lewis and Clark Expedition mapped the territory from Missouri to the Pacific Ocean.
http://www.archives.gov/education/lessons/lewis-clark/ -
Congress passed a law to move native americans to the southeast to the west.
http://www.historynet.com/indian-removal-act -
The Texas Revolution paved the way for the annexation of Texas.
http://militaryhistory.about.com/od/battleswars1800s/p/alamo.htm -
1000 head west on the Oregon trail.
http://www.historyglobe.com/ot/independence.htm -
More than 80,000 people move west for the gold rush.
www.history.com/topics/gold-rush-of-1849 -
This allowed families to move west and settle land for free.
http://www.archives.gov/education/lessons/homestead-act/ -
The Transcontinental Railroad allowed people to travel from coast to coast in days instead of months.
http://www.bushong.net/dawn/about/college/ids100/history.shtml
