Roosevelt's Rough Riders
Jul 1 Theodore Roosevelt and his Rough Riders charge up San Juan Hill during US's successful assault on the city of Santiago [1]
- Jul 3 American troops, en route to the Philippines on the SS China, raise the American flag on Wake Island
- Jul 3 Dutch Automobile Club forms (KNAC)
- Jul 3 US Navy defeats Spanish fleet in Santiago harbor, Cuba
- Jul 4 French liner "La Bourgogne" collides with bark Cromartyshire, 560 die
- Jul 4 US flag hoisted over Wake Island (Spanish–American War)
- Jul 5 Lizzie Arlington becomes first woman to play professional men's baseball when she pitches 9th inning for the Reading Coal Heavers against the Allentown Peanuts; allows 2 hits and walks a batter but preserves 5-0 win
- Jul 6 US Senate agrees to annex Hawaii
- Jul 7 US President McKinley signs the Organic Act to annex Hawaii
- Jul 8 Philadelphia Phillies pitcher Red Donahue no-hits Boston Beaneaters, 5-0 at the Baker Bowl
- Jul 8 The shooting death of crime boss Soapy Smith releases Skagway, Alaska from his iron grip
US Fleet Occupies Isla Grande
Jul 8 US battle fleet under Admiral George Dewey occupies Isla Grande at Manila
Golgi Apparatus
Jul 15 Camillo Golgi discovers the Golgi Apparatus (a delicate network inside cells essential for the transmission and reception of information between cells)
Spain Declares War Against the United States
Jul 17 Spanish–American War: Spaniards surrender to US forces at Santiago de Cuba