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Thomas Jefferson pays $15 million dollars for the Midwest-area territory in North America -
Lewis and Clark set off to explore the Louisiana Purchase territory -
US declares war on Britain because of their interference in the US plan to expand westward -
British forces invaded Washington DC and captured the city, then burned many federal buildings during the War of 1812 -
Construction began on the Baltimore/Ohio railroad, making it easier to trade and expanded the idea of western expansion -
This war was fought for the US to gain California and other western states -
Gold is found in California and thousands of Americans migrate west, expanding manifest destiny -
America bought a small plot of land below current-day Arizona and New Mexico from Mexicio for $10 million -
Abraham Lincoln is elected as 16th president of the USA -
This war was between the Confederate and Union states over the expansion of slavery into western states