Premise: Theodore Roosevelt Jr. ( [ ˈroʊzəvɛlt ] ; October 27 , 1858 -- January 6 , 1919 ) was an American statesman , author , explorer , soldier , naturalist , and reformer who served as the 26th President of the United States from 1901 to 1909 . Following the near-simultaneous deaths of his wife and mother , he escaped to a cattle ranch in the Dakotas . Roosevelt served as Assistant Secretary of the Navy under President William McKinley , but resigned from that post to lead the Rough Riders during the Spanish -- American War . Following McKinley 's assassination in September 1901 , Roosevelt became president at age 42 , and remains the youngest president .
Hypothesis: Theodore Roosevelt was active.
Label: ENTAILMENT