A-Z Index

Browse our articles in alphabetical order to learn more about the life of Theodore Roosevelt as well as people, places and events which took place during his lifetime and beyond. These articles have been written or reviewed by historians to ensure their accuracy.

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Hagedorn, Hermann

Hermann Hagedorn is remembered for his biographies of Theodore Roosevelt and his work to promote the legacy and ideals of Roosevelt through his long service to the Theodore Roosevelt Association.

Hagner, Isabella

Isabella (Belle) Hagner became the first social secretary to a First Lady when Edith Roosevelt hired her on October 2, 1901.

Hanna, Marcus Alonzo

Marcus Alonzo Hanna (1837-1904), a wealthy Ohio industrialist, political organizer, and United States Senator, epitomized the close relationship that existed between the titans of industry and politicians during America's Gilded Age.

Harriman, Edward H.

Edward H. Harriman was a railroad financier whose Northern Securities Company tangled with President Theodore Roosevelt and lost.

Hay-Herran Treaty

The United States Senate ratified the Hay-Herrán Treaty on March 17, 1903.

Hay-Pauncefote Treaty

President William McKinley instructed Secretary of State John Hay to renegotiate the Clayton-Bulwer Treaty (1850) with the British ambassador, Lord Julian Pauncefote. These discussions eventually resulted in the Hay-Pauncefote Treaty, which allowed the United States to build, fortify, and control an isthmian canal as long as British vessels were granted access to the canal on equal terms.

Henderson, David Bremner

David Bremner Henderson served as Speaker of the House of Representatives for the 56th and 57th Congresses—which included President Theodore Roosevelt’s first term—until Henderson’s surprise resignation in 1903.

Hepburn Act

The Hepburn Act of 1906 was a bill that fortified the powers of the Interstate Commerce Commission (ICC) and strengthened federal regulation of railroads.

Hill, James Jerome

James Jerome Hill is best known as the “Empire Builder” who masterminded construction of the Great Northern Railroad and created a corporation controlling major lines in the northern tier of the United States.