Answer:
After World War I, senators in the United States objected to foreign policy decisions being made by international organizations rather than US leaders. This led to the rejection of the Treaty of Versailles and the US not joining the League of Nations. The rejection of the Treaty of Versailles and the failure of the US to join the League of Nations had significant consequences, as it weakened the international cooperation and collective security envisioned by the League, and contributed to the rise of isolationist sentiment in the US. This isolationist sentiment was a major factor in shaping US foreign policy in the interwar period, and it ultimately influenced the country's response to the rise of fascist regimes in Europe in the 1930s. The US's decision to pursue a policy of neutrality in the early years of World War II was influenced in part by the desire to avoid being drawn into another costly and deadly war, a sentiment that was rooted in the rejection of internationalism and the League of Nations after World War I.