Theodore (Teddy) Roosevelt (1858-1919) was theRoosevelt increased the size of the U.S. Navy and started construction of the Panama Canal (a canal across Panama to connect the Atlantic Ocean and the Pacific Ocean). Roosevelt served from 1901 until 1909. He won the Nobel Peace Prize for helping end the Russo-Japanese War. Roosevelt died on January 6, 1919, in Oyster Bay, New York. 26th president of the United States.