Causes of American Civil War by Jose and Kevin By Josearroyo Mar 14, 1794 Invention of cotton gin click here! Mar 3, 1820 Missouri Compromise Click Here G An effort by congress to defuse the sectional and political rivalries triggered by the request of Missouri. May 21, 1826 'Bleeding Kansas' Click here Rival governments had been established in Kansas Aug 8, 1846 Wilmot Proviso Click here homie He proposed an american law to ban slavery. Apr 12, 1861 Fort Sumter is fired upon click here G there was a battle here. Located in South Carolina.