Theodore "T.R." Roosevelt, Jr. (/ˈroʊzəvɛlt/ roh-zə-velt;) (October 27, 1858 – January 6, 1919) was the 26th President of the United States (1901–1909). He is noted for his exuberant personality, range of interests and achievements, and his leadership of the Progressive Movement, as well as his "cowboy" persona and robust masculinity. He was a leader of the Republican Party and founder of the first incarnation of the short-lived Progressive ("Bull Moose") Party of 1912. This book covers his life and history and his influences on the United States.