- First U.S. combat troops arrive in France as U.S. declares war on Germany.
- Dutch dancer Mata Hari is convicted and executed as a German spy.
- "I Want You." Poster, featuring Uncle Sam, attracts thousands of U.S. recruits to WWI duty.
- Between ten and fifteen thousand blacks silently walk down New York City's Fifth Avenue to protest racial discrimination and violence.
- The first Pulitzer Prizes are awarded
Historical Highlights from 1917