Because the United States figured out how to defeat the aliens the first time around, told everyone else about their plans to bring down their shields and succeeded, then lead the world wide counter strike and defeated the first City Destroyer, the world won because of them, no doubt they played a part in the rebuilding process too.
So the first nation to defeat the aliens plays the biggest part in the international defense force, kind of like how the USA was responsible for the Allies winning World War 1 despite entering last, if it wasnt for the Marines arriving in France in large numbers then Paris would have fallen and the war lasted longer, the Americans stopped that and forced the surrender, they also entered World War 2 and saved the British and Soviets from total defeat and surrender, both were being defeated and the American entry saved them.
The Americans winning both wars made them the primary world powers, so winning a war against aliens makes them the number one military power, everyone else takes orders from them, its all logical.
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