The first president of United States was George Washington. He served from the years 1789-1797, and his vice president was John Adams, but there are also theories that John Hanson, President of the United States in Congress Assembled, 1781–1782. 1898. According to the American National Biography, the biographies of Hanson are not "adequate", though this is one, written by Hanson's grandson, is "perhaps the most satisfactory" of the lot.
Thank you ;DD