Answer:
Because ww1 ended.
Explanation:
I don’t know. That makes the most sense to me.
True the US joined in 1945 after the bombing of pearl harbour
In 1819, the spectacular post-War of 1812 economic growth concluded. Banks throughout the country were collapsed; mortgages were ruled out, individuals were forced to leave their houses and off their agricultural farms. Falling costs impaired agriculture and producing, unemployment covered the whole country.
