What actions have Presidents Bush, Obama and Trump taken in response to the threat of terrorism?

What actions have Presidents Bush, Obama and Trump taken in response to the threat of terrorism?

I need to answer this question in a minimum of 200 characters with at least two references listed in APA formatting

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The Bush, Obama and Trump’s Counterterrorism Policies in the United States
The September 11th attack is one of the worst disasters that ever happened in the United States with a loss of almost three thousand lives, and 6,000 others sustained injuries. The Federal government has since then taken upon itself the role of fighting terrorists and maintaining peace in the country.

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