which event led to an heightened focus on national security? the patriot act war in afghanistan september 11…

Brief Explanations:

The September 11 attacks were a series of coordinated terrorist attacks by the Islamic terrorist group al - Qaeda against the United States on September 11, 2001. These attacks led to a significant and heightened focus on national security in the United States and around the world. The USA Patriot Act was a legislative response to the 9/11 attacks, and the war in Afghanistan was launched in response to the attacks as well. The Japanese Treaty of 1960 is a bilateral security treaty between the US and Japan and not directly related to the modern - day heightened focus on national security in the context of the question.

Answer:

September 11 attacks