Attacks on government buildings and structures in the United States

The September 11 attacks, colloquially known as 9/11, were a coordinated series of suicide attacks perpetrated by the Islamist terrorist organization al-Qaeda against the United States in 2001. Nineteen terrorists hijacked four airliners, then flew one into each of the Twin Towers at the World Trade Center in New York City. The third plane crashed into the Pentagon, the headquarters of the United States Department of Defense, in Arlington County, Virginia. The fourth plane crashed in a rural Pennsylvania field during a passenger revolt. In response to the attacks, the United States launched the global war on terror, seeking to eliminate hostile groups deemed terrorist organizations, and the governments purported to support them. This foreign policy agenda was conducted over the next two decades.

1995 terrorist attack in the United States

2001 hijacking of an airliner and subsequent deliberate crash into The Pentagon in Virginia, USA

December 2015 mass shooting in San Bernardino, California

2019 mass shooting in Virginia Beach

1898 white supremacist insurrection and coup d'état in North Carolina, United States

armed confrontation between Republicans and Democrats in Colfax, Louisiana

armed occupation of a US federal protected area in Oregon in 2016

2025 fire in Harrisburg, Pennsylvania, USA

mass shooting at a rail yard in San Jose, California, United States, on May 26, 2021; the deadliest mass shooting in San Francisco Bay Area history

American shooting