What Happened on March 10?

March 10 is Harriet Tubman Day — honoring the conductor who never lost a passenger — and MAR10 Day for Mario fans, on the same calendar page as Bell's first phone call and a Mars orbiter arrival.

• 1848 — U.S. Senate ratifies the Treaty of Guadalupe Hidalgo, ending the Mexican-American War

  The Senate approved the peace treaty with Mexico, adding vast territory — including California and the Southwest — to the growing United States. Read the full story →

• 1876 — Alexander Graham Bell makes the first successful telephone call

  Alexander Graham Bell spoke into his new invention and his assistant heard him through a wire in the next room — the first successful telephone call in history. Read the full story →

• 1913 — Harriet Tubman dies after a lifetime of courage

  Harriet Tubman, who escaped slavery and then risked her life again and again to guide others to freedom on the Underground Railroad, died at her home in New York. Read the full story →

• 1959 — Tibetan uprising begins in Lhasa; Tibetans mark the date every year

  Crowds gathered in Tibet's capital to protect the Dalai Lama from feared capture, beginning an uprising against Chinese rule that is commemorated worldwide each March 10. Read the full story →

• 2006 — Mars Reconnaissance Orbiter arrives at the Red Planet

  NASA's most powerful camera-carrying orbiter to date fired its engines and slipped into orbit around Mars on March 10, 2006. Read the full story →

Famous birthdays

Lillian D. Wald (1867–1940) · Sharon Stone (1958) · Chuck Norris (1940)

Days & observances

Harriet Tubman Day · International Day of Women Judges · MAR10 Day (Mario Day) · National Women and Girls HIV/AIDS Awareness Day · National Pack Your Lunch Day