How did the United States increase support for the war effort?

a wide range of volunteer efforts and submitting to government-managed rationing and price controls. Providing supplies to American and Allied troops fighting the war in Europe, Africa, and the Pacific required the efforts of all Americans. At home, citizens contributed to the war effort by rationing consumer goods, recycling materials, purchasing war bonds, and working in war industries.

it affected it because the kingdoms (with trade) slowly got richer and richer.

the answer is "focused on"

lol gave an answer 1 week that's the answer for those who need it in the future xd