John Denison Baldwin was an American politician, Congregationalist minister, newspaper editor, and popular anthropological writer. He was a member of the Connecticut State House of Representatives and later a member of the U.S. House of Representatives from Massachusetts. In Ancient America, In Notes on American Archaeology he speculated on the origins of the "Mound Builder" people then believed to have constructed the famous mounds around the Mississippi and Ohio River Valleys, suggesting that they had been an aboriginal people who had migrated northwards from Central America or Mexico. He rejected the then-common notion that they had been a lost European, Semitic, or Asiatic people who had been wiped out by the North American Indians, asserting on the contrary that the Mounds were "wholly original, wholly American" and "did not come from the Old World". He did, however, still subscribe to the idea that these "Mound Builders" were not the same as the American Indian inhabitants of the region at that time, who he believed were a separate race originating in Asia.