Actually, Jeremy, America is more successful at a lot of things, including pulling other nations' butts out of the fire in wartime.
With the help of Russian (!), Polish, Canadian, Brittish, soldiers from several other nations. After all, it was a
World War. During World War II, the United States began to provide significant military supplies and other assistance to the Allies in September 1940, through a Lease-Lend deal, even though the United States officially only entered two years into the war, after the attack on Pearl Harbour. The USA formally maintained neutrality up until that moment. The American public generally resisted involving the United States in the European conflict.
But hey, nobody is complaining, also since the USA is now being led by the nose to a new war that Saudi Arabia wants your country to start on their behalf.
Cheers,
Bart