Final answer:
The Homeland Security Act of 2002 supports the DHS records management system.
Step-by-step explanation:
The federal legislation that supports the DHS records management system is The Homeland Security Act of 2002. This act authorized the creation of the Department of Homeland Security (DHS) and consolidated the powers that were previously under the jurisdiction of various agencies. It established the framework for the DHS to develop and maintain its records management system.