The 9/11 terrorist attacks are significant in U. S. history because they changed

The 9/11 terrorist attacks are significant in U. S. history because they changed the entire perspective of the nation — and called for a more effective method of mitigating the threat of terrorism. The attacks changed the outlook of the people on terrorism and terroristic groups.
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Research acts of terrorism occurring in the United States within the past five years. Choose one and briefly discuss how it impacted the United States.
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Additionally, discuss how the Department Homeland Security and local and state governments work to improve America’s preparedness, response, and recovery to technological disasters, and increase the U.S.’s overall sustainability.