Granted by Congress on December 8, 1941, the United States enters the Second World War on the side of the Allies. Labelling Pearl Harbor as “a day which will live in infamy,” President Roosevelt petitioned congress to grant him the declaration one day following the attack. Citing the preemptive strike on Pearl Harbor, the United States was left with no alternative, but to enter World War II. America would engage all three of the Axis powers: Japan, Germany, and Italy in a two-theater war. The shock of America being attacked on its own soil led to the objective of preventing future attacks of the same nature.This was also the last instance, in which the United States formally declared war on a nation.
