In fact, this was accepted as the most accurate measurement of the speed of light for the next forty years, at which point Michelson measured it again. The next lecture is on the Michelson-Morley experiment to detect the aether.
The United States declared war on Germany on April 6, 1917. There was two major reasons. First off, the German U-Boats sank 3 passenger ships carrying US civilians and citizens.
President Roosevelt, wearing a black armband, signs the Declaration of War against Japan on December 8, 1941. On December 8, 1941, the United States Congress declared war upon the Empire of Japan in response to its surprise attack on Pearl Harbor the prior day.