How did the united states respond to the fall of france in 1940?

Hey You!

The phony war ended when Hitler overran Denmark and Norway and took over the Netherlands and Belgium. He blitzed without mercy and forced France to surrender. The fall of France meant the only thing that stood between Hitler and the world was Britain. If the English lost, Hitler would have all of Europe and may attack the US. So Roosvelt moved and called to build armed forces. 1.2 million troops and 800,000 reserves would be trained.

And That's Your Answer! ^

The US was outraged, and so declared war on germany

The market had lost much of its value.