They lost because of their arrogance and lack of commitment.
Same reason why we've lost every war since WW2.
In reality we lost WW1 and WW2. What did we gain? Did we free Asia and Europe or did murderous Russian and Chinese communism take over? We goaded Japan into attacking us and were arming the countries fighting Germany. And never have paid for either war or the interest on the money. The wars have broken us and put us at the mercy of the central bankers. Should have taken George Washington's advice and stayed out of the affairs of countries across the sea.
