All of the following describe America's policy of isolationism except:

World War I Germany's unfettered submarine warfare against American ships during World War I provoked the U.S. into abandoning the neutrality it had upheld for so many years. The country's resultant participation in World War I against the Central Powers marked its first major departure from isolationist policy.

answer; (a) he was a u.s senator for 38 years;

b. great plains

hope this