How did rationing lead to american victory

What were the effects of rationing?

Rationing resulted in one serious side effect: the black market, where people could buy rationed items on the sly, but at higher prices. The practice provoked mixed reactions from those who banded together to conserve as instructed, as opposed to those who fed the black market's subversion and profiteering.

Explanation:

Americans contributed to the war by rationing, they rationed supplies such as gasoline, butter, sugar, and milk. It avoided public anger so rich people won't get more supplies during the war than others.