True. The two major anti-war movements in the US were the America First isolationist movement, which patriotically disbanded after the attack on Pearl Harbor and the declarations of war by the US, and the anti-war movement led by the American Communist Party after the Hitler-Stalin pact of August 1939 up until Hitler attacked the USSR in June of 1941. By the time the US entered the war, American Reds were vociferously eager to fight the Nazis so as to save the USSR.False. The anti war movement in the North during the US Civil War was huge. "Copperheads" were the key group in this ant war coalition. Peace candidate McClellan was very popular and could have beaten Lincoln had Atlanta not fallen in late 1864. The anti war movement climaxed in a huge race-draft riot in NYC. It was a huge event.