There was an increasing fear of foreign people after WW1. This was due to the war, but mainly the fear that they would take American jobs (because they accepted lower wages.) ... RESULT The USA became isolated from other countries both economically (trade) and politically (by staying out of the affairs of other countries.)8 May 2007
These Compromises were trying to solve the slavery and anti-slavery of the states. It was a concern that there would be an out-of-balance number of states for or against slavery.