Bryan McAllister’s personal reference notebook
September 12, 2026Short & citedBlog
Civic Viewpoint.
A quiet encyclopedia with a personal desk
Kept by Bryan McAllister — short guides, clear facts, and the Canadian angle when it matters.
Civic Brief • Us Presidents

Theodore Roosevelt

Theodore Roosevelt (1858–1919) was the 26th president of the United States, serving from 1901 to 1909.

Updated September 12, 20261 min readCited sources

Theodore Roosevelt (1858–1919) was the 26th president of the United States, serving from 1901 to 1909. A Republican reformer, he expanded presidential power, championed conservation, and won the 1906 Nobel Peace Prize.

What it is

Roosevelt became president in 1901 after the assassination of William McKinley, making him the youngest person to hold the office at age 42. His presidency is defined by the Square Deal, trust-busting, and conservation. He also served as governor of New York and vice president before taking office.

Why it matters

Roosevelt helped position the United States as a major world power through an active foreign policy, including the Panama Canal project and mediating the Russo-Japanese War. His domestic reforms strengthened the modern presidency and set precedents for federal regulation of big business and protection of natural resources.

Key details

Roosevelt was born into a wealthy New York family and overcame childhood health problems with a vigorous personality. After leaving office in 1909, he remained politically active and is remembered as one of the most influential U.S. presidents. His Nobel Peace Prize in 1906 recognized his diplomatic work.

In short

  • 26th U.S. president (1901–1909), youngest to take office at 42.
  • Known for the Square Deal, trust-busting, and conservation.
  • Won 1906 Nobel Peace Prize for mediating the Russo-Japanese War.
  • Expanded presidential power and U.S. global influence.
Canadian angle

Roosevelt’s presidency affected Canada through broader U.S. foreign policy, western hemisphere diplomacy, and early twentieth-century North American relations.

Quick questions

Who was Theodore Roosevelt?
Theodore Roosevelt was the 26th president of the United States and a leading American reformer, writer, and naturalist.
Why did Theodore Roosevelt become president?
He became president after President William McKinley was assassinated in 1901.
What is Theodore Roosevelt best known for?
He is best known for conservation, antitrust action, progressive reforms, and expanding presidential power.

Sources

  1. Encyclopaedia Britannica — https://www.britannica.com/biography/Theodore-Roosevelt
    Supports: Birth and death dates, presidency dates, Nobel Prize, major achievements, and overall biography.
  2. White House Historical Association — https://www.whitehousehistory.org/bios/theodore-roosevelt
    Supports: Youngest president, accession after McKinley’s assassination, reform agenda, and conservation achievements.
  3. U.S. National Park Service — https://www.nps.gov/articles/000/theodore-roosevelt-biography.htm
    Supports: Presidency dates, election in 1904, modernization of the presidency, conservation, and public role.
  4. Nobel Prize — https://www.nobelprize.org/prizes/peace/1906/roosevelt/biographical/
    Supports: Birth and death dates and background biographical details.
  5. Theodore Roosevelt Center — https://www.theodorerooseveltcenter.org/biography/
    Supports: Succession to the presidency in 1901 and election in his own right in 1904.