The relationship between magnetism and electric current was discovered by
A. Hans Christian Oersted
Constitution is "supreme law of the land".No state could make laws or take actions that go against the constitution.
The Gentleman's Agreement of 1907 is best described as "The United States would not segregate Japanese immigrants, and Japan would not allow further emigration to the United States." :)
He did not want to get involved with the North Atlantic Treaty. A conservative position that many have criticized. However, Senator Taft was more interested in the protection and preservation of his own country. Right after the Vietnam war, his foreign policy was taken seriously. He was more concerned about his nation's defense than to get involved with wars.