Question

Most of the economic growth in the United States following World War I was a result of what?

Answer 1

The competitive advantage of the U.S. as a manufacturing power over much of Europe, whose factories and infrastructure were largely ruined by the war and the subsequent flu pandemic.

Answer 2

America had heavily supported the Allies with supplies...

Step-by-step explanation:

...so the allies fell in debt to America, and they payed it back, which improved the economy.