What event caused the establishment of the united states department of homeland security? attack on the world trade center in 1993 bombing of the us embassy in kenya in 1998 attack on us naval vessel uss cole in 2000 attacks on the united states on september 11, 2001

The event that caused the establishment of the United States Department of Homeland Security was the attacks on the United States on September 11, 2001.

Explanation:

The United States Department of Homeland Security is a department of the United States Government with the responsibility of protecting the US territory from terrorist attacks and responding to natural disasters. The department was created from 24 federal agencies already in existence in response to the attacks of September 11, 2001.

While the Department of Defense is responsible for military actions, the Department of Homeland Security works in the civilian sphere to protect the United States inside and outside its borders. Its objective is to prepare, prevent and respond to national emergencies, especially terrorism.

b: the exchange of coined money