Answer:
After WWI, the United States became more involved in European affairs than before the war. As a result of its victory in the war, the US assumed a leadership role in international affairs, taking a more active role in global politics and further establishing itself as a superpower. It also became more involved in the economic, political, and cultural life of the European continent. The US helped shape the policy of the League of Nations, and provided economic aid to Europe in order to rebuild and stabilize the continent's economy. Additionally, the US became involved in the creation of the Treaty of Versailles, which formally ended WWI. All of these factors helped to establish the US as a major player in European affairs.