This is the correct statement.
Sacrifice is in terms of lives lost.
Contribution is in valuation of the production and food.
America has never experienced war on the scale of the EUropeans and Russia, or the Chinese. These countries have lost millions onf people. American values life, but we are adverse to losing lives, and have no stomach for losing a million men, or women even in WWII; when the US contemplated lossing an additional 1.5m in the invasion of Japan, we nuked them instead and suffered the “fallout” so to speak.
Germany lost 15,000 alone, just invading Poland. It wasn’t necessarily the cakewalk for them people thought it was.