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Lieutenant Governor of Mississippi: J. H. Jones (Democratic) (until month and day unknown), James T. Harrison (Democratic) (starting month and day unknown)
January 1 – Hawaii asks for a delegate at the U.S. Republican National Convention.
January 2
John Hay announces the Open Door Policy to promote trade with China.
The first electric bus becomes operational in New York City.
January 3
The United States Census estimates the country's population was 70 million.
Giuseppe Verdi's opera Aida makes its U.S. debut.[1]
January 5 – Dr. Henry A. Rowland of Johns Hopkins University discovers the cause of the Earth's magnetism.
January 8 – President of the United StatesWilliam McKinley places Alaska under military rule.
January 14 – The United States Senate accepts the Anglo-German treaty of 1899, in which the United Kingdom renounces its claims to the Samoan islands.
January 17
Brigham H. Roberts is refused a seat in the United States House of Representatives because of his polygamy.
Yaqui Indians in Texas proclaim independence from Mexico.
January 29 – The American League of Professional Baseball Clubs is organized in Philadelphia, Pennsylvania with 8 founding teams.
February 3 – Kentucky Governor William Goebel dies of wounds after being shot by assassins on January 30. Goebel, who had prevailed in a dispute over the winner of the 1899 election, had been sworn in on his deathbed.
February 5 – Britain and the United States sign a treaty for the building of a Central American shipping canal through Nicaragua.
After a 13-day special session, the California legislature votes for Thomas R. Bard to fill the vacancy for its U.S. Senator vacant since March 1899.
February 9 – Dwight F. Davis creates the Davis Cuptennis tournament.
March 5 – Two U.S. cruisers are sent to Central America to protect U.S. interests in a dispute between Nicaragua and Costa Rica.
March 6 – A coal mine explosion in West Virginia kills 50 miners.
March 15 – The Gold Standard Act is ratified, placing United States currency on the gold standard.
March 24 – New York City Mayor Robert Anderson Van Wyck breaks ground for a new underground "Rapid Transit Railroad" that will link Manhattan and Brooklyn.
April–June[]
April 30
Hawaii becomes an official U.S. territory
Famous Train Engineer Casey Jones, dies in a wreck in Vaughan, Mississippi, while saving all of the passengers on his train.
May 1 – Scofield Mine disaster: An explosion of blasting powder in coal mine in Scofield, Utah kills at least 200.
May 23 – Sergeant William Harvey Carney is awarded the Medal of Honor for his actions in the Second Battle of Fort Wagner (July 18, 1863). While he is the 21st African American recipient of the medal, the action for which he is honored pre-dates all other African American recipients.
June 7 – American temperance activistCarrie Nation enters a saloon in Kiowa, Kansas, and destroys its stock of alcoholic beverages with rocks.
June 30 – Hoboken Docks Fire: A wharf fire at the docks in Hoboken, New Jersey owned by the North German Lloyd Steamship line spreads to German passenger shipsSaale, Main, and Bremen. The fire engulfs the adjacent piers and nearby ships, killing 326 people.
July–September[]
Galveston Hurricane
July 25 – The Robert Charles Riots occur in New Orleans, Louisiana, United States.
September 8 – The Galveston Hurricane makes landfall at Galveston, Texas, eventually killing 6,000–12,000 in the deadliest natural disaster in U.S. history.
September 13 – Philippine–American War: Filipino resistance fighters defeat a large American column in the Battle of Pulang Lupa.
September 17 – Philippine–American War: Filipinos under Juan Cailles defeat Americans under Colonel Benjamin F. Cheatham at Mabitac.
October–December[]
c. October 3 – The Wright brothers begin their first manned glider experimental flights at Kitty Hawk, North Carolina.
November 3 – The first automobileshow in the United States opens at New York City's Madison Square Garden.
November 6 – U.S. presidential election, 1900: Republican incumbent William McKinley is reelected by defeating Democratic challenger William Jennings Bryan on a record turnout of 73.7%.
Undated[]
Milton S. Hershey introduces the milk chocolateHershey bar.
In New Haven, Connecticut, Louis Lassen of Louis' Lunch makes the first modern-day hamburger sandwich.
At the Carnegie Steel Company, Slavs and Italians produce one-third of the world's total steel supply.
^Kuiper, Kathleen (1995). Merriam-Webster's Encyclopedia of Literature. Springfield: Merriam-Webster. p. 508. ISBN978-0-87779-042-6.
Further reading[]
"Domestic Chronology", Statistician and Economist, San Francisco: Louis P. McCarty, 1905, pp. 227–347 – via HathiTrust. (Covers events May 1898-June 1905)