How did the selective service legislation pass in September 1940 contribute to mobilization

The nye committee report created the impression that america's entry into world war i was influenced by

The impeachment of president clinton by the u.s. house of representatives occurred with a. virtually all republicans supporting it, while virtually all democrats opposed it b. about two-thirds of republicans supporting it and about two-thirds of democrats opposing it c. half of all democrats and half of all republicans supporting it, while half of all democrats and half of all republicans opposed it d. virtually all democrats supporting it, while virtually all republicans opposed it

Was the civil war inevitable? could anything have been done through compromise to stop it, or did it have to happen?