USA HISTORY

Detailed explanation-1: -Wilson cited Germany’s violation of its pledge to suspend unrestricted submarine warfare in the North Atlantic and the Mediterranean, as well as its attempts to entice Mexico into an alliance against the United States, as his reasons for declaring war.

Detailed explanation-2: -During the 1930s, the combination of the Great Depression and the memory of tragic losses in World War I contributed to pushing American public opinion and policy toward isolationism. Isolationists advocated non-involvement in European and Asian conflicts and non-entanglement in international politics.

Detailed explanation-3: -The US closed the doors to immigration during the 1920’s. Early on the US had excluded Chinese, Japanese, and other Asians, but later the US began to exclude even Europeans, particularly eastern and southern Europeans.

Detailed explanation-4: -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.