To what extent did the U.S. turn its back on the rest of the world during the interwar period (1918-1939)?

Question

To what extent did the U.S. turn its back on the rest of the world during the interwar period (1918-1939)?

Answer 1

The US most notably refused to join the League of Nations, which many countries saw as the US turning their back on global affairs. Without the largest superpower in the League of Nations, the Treaty of Versailles was unable to effectively implement its policies, and the ones it did implement had glaring flaws. Most significantly, the botched implementation of Germany's punishment for WWI planted the seeds for WWII by destabilizing the German government and currency, as well as inadequately enforcing the demilitarization of the country. Furthermore, the United States refused to get involved in European affairs during the rise of Hitler, going so far as to turn back boats with Jewish refugees when persecution under Hitler's rule began to worsen. While the United States did subtly aid Britain by preemptively sending them weapons, the US largely leaned against involvement in global affairs until the attack on Pearl Harbor. To this extent, the US effectively turned its back on the rest of the world until the international crises brought by WWII forced the country to take direct action.