Isolationism
favored u. s. involvement in international affairs
dominated u. s. policy in the years immediately following world war i
contributed to american neutrality in the early years of world war ii
encouraged u. s. aid to the allies in europe

Dominated us policy in the years immediately following world war i

as a result of disappointment effects of the war, the united states returned to the policy of isolationism and not  ratify the treaty of versailles, did not join the league of nations, were initiated pact to abandon war as an instrument of national policy, as well as preserved neutrality in armed conflicts in the thirties.