Which of the following illustrates a way the US attempted to isolate itself after World War I?

The failure to ratify the Treaty of Versailles is a key example of how the United States endeavored to isolate itself following World War I. The Treaty of Versailles was seen as a critical document that formally ended the war and established the League of Nations, aimed at promoting international cooperation and preventing future conflicts. However, there was significant opposition within the U.S. Senate, particularly from isolationists who believed that participation in such a global organization would entangle the nation in foreign affairs and military commitments that were contrary to American interests.

By not ratifying the Treaty, the U.S. signaled its reluctance to engage in international alliances and emphasized a preference for a more isolationist foreign policy stance. This decision reflected broader public sentiment at the time, which favored focusing on domestic issues rather than becoming involved in international disputes. As a result, this moment marked a significant turn towards isolationism in U.S. foreign policy in the years following the war.

The other choices suggest actions that would involve engagement with the international community, which would contrast with the isolationist policies that characterized the period after World War I.