What did roosevelt mean when describing the united states as the “arsenal of democracy”?

Trench warfare began after germany failed in its initial plan to seize france and bring a quick end to the war. negotiate a temporary truce with the allied forces. attack the allies by sea with its powerful navy. storm across the eastern front to attack russia.

World war i brought increased immigration to the united states from which country? germany france italy mexico

Which expression is equivalent to (fg)(5)