Question

the department of homeland security was created to
keep noncitizens from entering the united states.
protect the united states from terrorist attacks.
make us citizens more secure in their homes.
strengthen us military presence overseas.

Explanation:

The U.S. Department of Homeland Security was established in the aftermath of the 9/11 terrorist attacks, with its core primary mission focused on safeguarding the U.S. from terrorist threats and related domestic security risks. The other options do not align with its foundational purpose: it does not solely block noncitizen entry, its focus is not home security for citizens in the residential sense, and it does not handle overseas military presence.

Answer:

protect the United States from terrorist attacks.