* The United States was the only major power to emerge from the war unscathed. The European powers were all left devastated, both economically and politically. The United States, on the other hand, had not suffered any significant damage during the war.
* The United States had a strong economy. The United States had been able to avoid the worst of the economic damage that had affected Europe. In fact, the United States had actually benefited from the war, as it had become a major supplier of goods and services to the Allied Powers.
* The United States had a powerful military. The United States had the largest navy in the world and a rapidly growing air force. The United States also had a large and well-equipped army.
* The United States had a strong diplomatic presence. The United States had been a key player in the negotiations that had led to the end of the war. The United States was also a founding member of the League of Nations, the international organization that was created to promote peace and security in the aftermath of the war.
As a result of these factors, the United States became the dominant power in the world after World War I. The United States played a leading role in international affairs, and its influence was felt in all corners of the globe.