What part of america took part in ww2,why​

On December 7, 1941, following the Japanese bombing of Pearl Harbor, the United States declared war on Japan. Three days later, after Germany and Italy declared war on it, the United States became fully engaged in the Second World War.

Explanation:

the answer is "focused on"

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

an early twentieth-century ad for model home blueprints