Which agency primarily manages maritime border security in the U.S.?

The U.S. Coast Guard is the agency primarily responsible for managing maritime border security in the United States. This is due to its specific mission of protecting the nation's waterways, conducting search and rescue operations, and enforcing laws related to maritime security and immigration. The Coast Guard has a unique role that encompasses both law enforcement and emergency management, allowing it to effectively patrol U.S. waters and ensure compliance with maritime laws and regulations.

While U.S. Customs and Border Protection plays a vital role in securing borders, its primary focus is on land borders and air travel. The Department of Homeland Security oversees the Coast Guard along with other agencies that contribute to national security, but it does not directly manage maritime operations. U.S. Immigration and Customs Enforcement is primarily involved in immigration enforcement and customs investigations rather than specific maritime security matters. Thus, the Coast Guard's dedicated focus and operational capabilities make it the correct choice for managing maritime border security.