Theodore Roosevelt
26th President of the United States from 1901 to 1909 (1858–1919)
Theodore Roosevelt Jr. (October 27, 1858 – January 6, 1919) was the 26th president of the United States, serving from 1901 to 1909. Previously serving for six months as vice president under William McKinley, Roosevelt became president after McKinley's assassination in 1901. He was 42 years old upon his first inauguration, making him the youngest person to hold the office.
A sickly child with debilitating asthma, Roosevelt overcame health problems through a regime of vigorous exercise, which he called "the strenuous life". He was homeschooled and began a lifelong naturalist avocation before attending Harvard University. His book The Naval War of 1812 established his reputation as a historian and popular writer. Roosevelt became leader of the reform faction of Republicans in the New York State Legislature. After the simultaneous deaths of his first wife Alice Hathaway Lee Roosevelt and mother Martha Bulloch Roosevelt, he recuperated by buying and operating a cattle ranch in the Dakotas. Roosevelt served as the assistant secretary of the Navy under McKinley, and in 1898 helped plan the successful naval war against Spain.
This brief starts where responsible research should: with the source description of “Theodore Roosevelt” as 26th President of the United States from 1901 to 1909 (1858–1919). Everything that follows is an evidence route, not borrowed authority.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 22, 2026. The linked authority identifier is Q33866. VIAF identifies the subject as 44346731. The Library of Congress control number is n79027239. 3 of 3 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank. The first chronological checks are 1858, 1919, 1901 and 1909.
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This entry incorporates text from “Theodore Roosevelt” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.