Exactly 70 years ago Japan hit Pearl Harbor with one of the most stunning surprise attacks in history. The attack came as a profound shock to the American people and led directly to the American entry into World War II in both the Pacific and European theaters. The following day (December the United States declared war on Japan. Domestic support for isolationism, which had been strong[citation needed], disappeared. Clandestine support of Britain (for example the Neutrality Patrol) was replaced by active alliance. Subsequent operations by the U.S. prompted Germany and Italy to declare war on the U.S. on December 11, which was reciprocated by the U.S. the same day.