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. 

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.