Macon's Ocmulgee mounds are now part of a national historic park. The area was a national monument and earned an expanded designation under the law President Trump signed in early March. The park is exponentially expanding in size -- going from 702 acres to nearly 3,000. The Muscogee Indians built the Ocmulgee mounds more than a thousand years ago. They also identify as the "Creek" nation. GPB reporter Grant Blankenship has been following the story in Macon and spoke with "On Second Thought"