Final answer:
After World War 1, the United States initially adopted an isolationist approach but later shifted to active engagement in world affairs.
Step-by-step explanation:
After World War 1, the United States initially adopted an isolationist approach towards world affairs. This was based on the belief that Europe should govern its affairs. However, after World War II, the United States became one of the superpowers and actively engaged in world affairs. The United States shifted from isolationism to active engagement, realizing the need to be involved in global issues.