What lead to the u. s. economy rising and creating an age of prosperity during the 1920s?

The US economy started booming in the 1920s because WWI was just ended/coming to a close and all of the money that was spent on war supplies made companies and workers richer as well the war debt and damage of our alies needing supplies that we gave giving us even more money and prosperity. 

If you make it more clear i can answer it