Why did the U. S. government use rationing for some foods and consumer goods during World War II?

I have not technically learned about WWII yet, but I can infer that they had to ration foods as the countries they were in war with (and their own country) had to send their men to war, so no one was working on the farms. Resulting in a lack of food and goods.

there are more but this is what i can come up

new york- english

new orleans- french

new hampshire- english

new mexico- spanish

new jersey- english

the decreasing neutrality of the u. s. in world war i

hope this : )