What action did the U.S. take following the end of the First World War?

Following the end of the First World War, the United States took significant steps to demobilize its military forces, which is reflected in the selection of this answer. After the war concluded in November 1918, there was a strong desire among American leadership and the public to return to a peacetime state. The U.S. had mobilized millions of troops for the war effort, and as the conflict ended, the priority shifted to reducing the military size and returning soldiers to civilian life.

The rapid demobilization was influenced by several factors, including a desire to cut wartime expenditures, the belief that a large standing army was unnecessary in peacetime, and a general sentiment within American society that favored isolationism. The demobilization plan led to the reduction of army personnel from over four million troops at the war's conclusion to fewer than 150,000 by 1920.

In this historical context, while other actions, such as increases in defense spending or establishing permanent bases, might have been considerations for the future, the immediate response post-war was towards winding down military involvement and reverting back to pre-war military levels.