22. why did many americans oppose u. s. participation in world war i1?

Many Americans oppose U.S. participation in World  War II for a number of reasons:

1) Americans did not want to have anything to do with any more European Wars, as the US went back to isolationism after World War I. 
2) Because of a mixed population, it was better to wait for a reason to declare war, as the population was divided in between the two sides.

hope this helps