There have been times in the history of the United States when the presidential election determined the future of Humanity.  Which one was the most important? A case has been made for 1940, when then President Franklin D. Roosevelt ran for his third term.   The makers of the Constitution did not include presidential term limits. Some had tried. In 1880, Ulysses Grant ran for a third term and failed. In 1912, Theodore Roosevelt also ran, but lost to William Howard Taft. Harry Truman sought a third term in 1952, but dropped out after losing in a primary. In  1940, FDR, a Democrat, ran against Republican Wendell Wilkie , who was an isolationist, and totally against the U.S. entering the war in Europe.  FDR too indicated his opposition to the war, but insiders knew that was just something he said in public,. Hitler and continued recovery from the Great Depression were compelling issues inducing FDR to go for a third term. Wilkie, a relative unknown, had upset Senator Robert Taft and New Yo