Why is the role of the United States in world politics growing so rapidly in the second half of the 20th century?

The reason for this is that during the Second World War, the United States did not suffer such colossal material and human losses as the European countries that fought against Germany and its allies. The United States, however, began hostilities against the Third Reich only in 1944, when the victory of the anti-Hitler coalition in the war was no longer in doubt. Thus, the Americans were able to extract the maximum benefit for themselves, participating in the division of spheres of influence in post-war Europe as a winner.