Historical events commemorated on September 11

Historical events commemorated on September 11 include the 1609 arrival of Henry Hudson in the area of present-day New York, where he explored Manhattan and the Hudson River. In 1936, President Franklin Delano Roosevelt opened the Hoover Dam on the Colorado River.

Significant political milestones occurred on this date in 1973 with the military coup in Chile against President Salvador Allende, and in 2001 with the terrorist attacks in the United States involving Al-Qaeda.