The missouri compromise was introduced by:
james tallmadge
daniel webster
john
c. calhoun
henry clay

The Missouri Compromise was introduced by "Henry Clay," since this was one of Clay's attempted to avert a civil war by created compromises over the issues involved with expansion. 

South carolina was so angry about the election of lincoln that they seceded from the union on december 20, 1860. they attacked fort sumter later, on april 12, 1861.