Question

(HURRY) What happened on September 11, 2001, to change Americans' ideas about national security?

Three different planes were hijacked in Boston.
The World Trade Center crumbled when dozens of simultaneous bombs exploded inside it.
Four different flights entered the country carrying bombs planted by international terrorists.
Symbolic, highly populated sites in the U.S. were attacked by terrorists coordinating their efforts.

Answer 1

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Your question: What happened on September 11, 2001, to change Americans' ideas about national security?

My Answer: Four different flights entered the country carrying b0mbs planted by international terrorists.

More Details:

Following 9/11, the federal government moved quickly to develop a security framework to protect our country from large-scale attacks directed from abroad, while enhancing federal, state, and local capabilities to prepare for, respond to, and recover from threats and disasters at home.

On September 11, 2001, 19 militants associated with the Islamic extremist group al Qaeda hijacked four airplanes and carried out sewerslide attacks against targets in the United States. Two of the planes were flown into the twin towers of the World Trade Center in New York City, a third plane hit the Pentagon in Arlington, Virginia, just outside Washington, D.C., and the fourth plane crashed in a field in Evansville, Pennsylvania. Almost 3,000 people were killed during the 9/11 terrorist attacks, which triggered major U.S. initiatives to combat terrorism and defined the presidency of George W. Bush

Answer 2

The Answer-Symbolic, highly populated sites in the U.S. were attacked by terrorists coordinating their efforts. This event changed Americans' ideas about national security.