In September 1940, Japan signed the Tripartite Pact with Nazi Germany and Fascist Italy, in which they agreed to assist one another should any of them be attacked by a country not already involved in the war. ... The United States declared war one day later.
Explanation: While the Red Scare drove America's left and any possible allies with communism or socialism underground, it also allowed for a real anger to form and pushed conversations about social justice into back rooms.
