He who wins the war, dictates the rules
Let us make clear at once an empirically incontrovertible factual truth: He who wins the war, dictates the rules of the post-war order. Whoever wins, writes history. Whether we like it or not, the defeated never had much decision-making power (which is not to say that they could not organize well to retaliate and return to power – but that is another matter).
World War II ended with the victory of the United States of America as the first, undefeated and predominant power. From there followed an expansion of U.S. influence toto orbe terrarum in all respects (cultural, economic, military, political).
This is always the case. We were lucky enough to win WWII. We had help, the British and the Soviets. When the US and British worked together they made Pax Americana. This is why there was hegemony and why the hegemony is breaking down. We are losing the war! The commies are winning, at this point.