Department of Homeland Security
Public safety is the responsibility of the Department of Homeland Security. Anti-terrorism, immigration, customs, border security, and cybersecurity are all handled by this department. While on his way to Berlin in 2002, President Bush established the department.
Source: Wikimedia
The following was the official announcement of its establishment: “The Office’s objective will be to create and implement a comprehensive national plan to protect the United States against terrorist threats and attacks. The office will coordinate the actions of the executive branch to identify, prepare for, prevent, protect against, respond to, and recover from terrorist acts in the United States.”