A cemetery created and maintained under an Act of Congress is called?

A cemetery created and maintained under an Act of Congress is referred to as a National Cemetery. National Cemeteries are established by the federal government to provide burial for military veterans, their spouses, and dependent children. These cemeteries are located across the United States and offer a dignified resting place, along with specific benefits like the provision of headstones, national honors at funerals, and ongoing maintenance.

The designation as a National Cemetery signifies that the cemetery meets particular standards set forth by federal law and serves a national purpose in honoring those who have served in the military. The history and management of National Cemeteries illustrate the commitment of the country to recognize and respect the sacrifices made by veterans.

While there are other types of cemeteries, such as American Cemeteries and Federal Cemeteries, these do not specifically denote the same meaning or legal standing as National Cemeteries, which are explicitly linked to congressional legislation. Congressional Cemetery is a specific location in Washington, D.C., but does not represent the broader category defined by the question.