How the US won in both theaters of WWII

"The United States is used to renting a land army. That’s how U.S.
military power works. It’s a lend-lease approach to war. In World War
II, we sent the Studebakers and the Jeeps and the radios and the Spam,
and the Soviets sent 27 million people to die in defeating Hitler’s land
army. In the Pacific theater, we sent Chiang Kai-shek some planes and
weapons, and he provided the soldiers. And he lost at least 13 million.
So we rented the Soviet land army in one theater and the Chinese land
army in another theater, and we sent materiel and finances, and we won
in both theaters as a result."
https://www.foreignaffairs.com/united-states/trump-and-future-american-power-stephen-kotkin