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.
Germany and Italy declared war on the United States in 1941 as a result of the United States' declaration of war against Japan in the wake of the attack on Pearl Harbor. Germany, Italy and Japan had previously entered into a military alliance called the ''Tripartite Pact,'' which unified their military goals and expansionist desires.