Which executive department would most likely to try to stop a terroist attack the department

Following 9/11, the United States Government created the new Department of Homeland Security.

The Department of Homeland Security is responsible for just that, Homeland Security, and is responsible for working to stop terrorists attacks on US soil.

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the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).