- Mar 2 Hawaii's first telegraph company opens
- Mar 2 United States Congress passes the Platt amendment, limiting the autonomy of Cuba as a condition for the withdrawal of American troops
- Mar 3 US Congress creates National Bureau of Standards, in Department of Commerce
- Mar 4 Term of George H. White, last of post-Reconstruction US congressmen, ends
McKinley's Second
Mar 4 William McKinley inaugurated for his 2nd term as US president; Theodore Roosevelt serves as Vice President; his inaugural address is the first to be published in advance
Wilhelm II
Mar 6 In Bremen an assassin attempts to kill Kaiser Wilhelm II of Germany.
- Mar 11 Cincinnati Enquirer reports Baltimore manager John McGraw signed Cherokee Indian Tokohoma, who is really black 2nd baseman Charlie Grant
- Mar 12 Ground is broken for Boston's 1st AL ballpark (Huntington Ave Grounds)
- Mar 13 Amidst increasing anti-gambling sentiment, wagering on horse racing is banned in San Francisco, CA; Ingleside Race Track closes March 15
- Mar 14 Germany's Chancellor von Bulow declares that the agreement Germany signed with Great Britain in October 1900, to restrain foreign aggression and maintain open trade, does not apply to Manchuria
Van Gogh Paintings Shown
Mar 17 At a show in Paris, 71 Vincent van Gogh's paintings cause a sensation, 11 years after his death
- Mar 17 Free-thinking Democratic League forms in Netherlands
Nellie Melba's Toast
Mar 23 Australian opera star Dame Nellie Melba reveals secret of her now famous toast
First Australian Parliament
Mar 29 Edmund Barton is elected Prime Minister in Australia's first parliamentary election
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