Theodore  Roosevelt Jr. ( ROH-zə-velt; October 27, 1858 – January 6, 1919), often referred to as Teddy Roosevelt or his initials T.R., was an American statesman, politician, conservationist, naturalist, and writer who served as the 26th president of the United States from 1901 to 1909. He served as the 25th vice president from March to September 1901 and as the 33rd governor of New York from 1899 to 1900. He served as the 25th vice president from March to September 1901 and as the 33rd governor of New York from 1899 to 1900. Roosevelt emerged as a leader of the Republican Party and became a driving force for the anti-trust policy while supporting Progressive Era policies in the United States in the early 20th century. His wife and his mother both died in rapid succession, and he escaped to a cattle ranch in the Dakotas. He served as Assistant Secretary of the Navy under President William McKinley, but he resigned from that post to lead the Rough Riders during the Spanish–American War, returning a war hero.