Explain the roles the United Nations and the Department of Homeland Security play in permitting refugees into the United States

They make sure that immigration laws are followed and they screen refugees that applied to enter the US.

Explanation:

The Department of Homeland Security,DHS is one of the agencies in the United States of America that is saddled with the responsibility of preventing terrorists into the country. The department of homeland security, DHS make sure that the borders are secure and make sure that the regulations and laws regarding immigration are followed properly.

The department of homeland security also make sure that there is no cyber to the the United States of America.

They make sure that immigration laws are followed and they screen refugees that applied to enter the US.

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