An example of U.S. isolationism following World War I is the demobilization of the armed services in the early-1920s, signaling a retreat from international engagement to focus on national interests. Therefore, option D is correct.
An example of U.S. isolationism following World War I is the demobilization of the armed services in the early-1920s. The period after World War I saw the United States turning inward, focusing on its own economic prosperity and political stability.
Despite President Woodrow Wilson's vision of collective security through the League of Nations, the U.S. did not ratify the Treaty of Versailles and subsequently retreated from international engagement, reflecting a broader sentiment to avoid further international conflicts.
This isolationist stance was further cemented by a swell of public anti-war sentiment and the passing of the Neutrality Acts in the mid-1930s, aiming to prevent the U.S. from becoming entangled in overseas wars.