What came first was the Louisiana Purchase. Napoleon sold Louisiana to the United States
when he failed reestablish an extension of the Empire after getting it from
Spain. This gave the Americans more
territory and many Americans wanted to move west. After that was Missouri Compromise where the
balance between slave state and Free state was maintained. With the creation of the Kansas Nebraska Act,
the Missouri Compromise was nulled as an effect. This would later affect the Kansas elections
and later lead to Civil War.
