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Invention of the cotton gin
The cotton gin was invented in 1794 by Eli Whitney.This machine greatly increased the speed of removing seeds from the cotton fiber. By the mid 19th century cotton was America's leading export.
http://www.history.com/topics/inventions/cotton-gin-and-eli-whitney -
Missouri Compromise
In 1819 the pro-slavery and anti-slavery factions began to tense and cause problems in the U.S. this lead congress to pass the Missouri Compromise to keep peace. This was an imaginary line that went across the Louisiana territory.
http://www.history.com/topics/missouri-compromise -
Tariff of 1828 & Nullification Crisis
