(A) Belligerence
(B) Aggression
(C) ** Isolationism
(D) Solitude
EXPLANATIONS BELOW
Concept note-1: -Isolationists advocated non-involvement in European and Asian conflicts and non-entanglement in international politics. Although the United States took measures to avoid political and military conflicts across the oceans, it continued to expand economically and protect its interests in Latin America.
Concept note-2: -The reasons for this rapid movement toward trying to isolate the nation from any involvement overseas were the severe economic depression of the decade and the emergence of aggressive, militaristic regimes in Europe and the Far East.
Concept note-3: -Thus, U.S. foreign policy during the 1920s was characterized by the enactment of isolationist policies; for instance, the U.S. opted not to join the burgeoning League of Nations, even though it had been the nation to first propose such international cooperation.