James Truslow Adams was an American writer and historian. He was a freelance author who helped to popularize the latest scholarship about American history and his three-volume history of New England is well regarded by scholars. He popularized the phrase "American Dream" in his 1931 book The Epic of America. No. 1 on The New York Times Nonfiction best seller list for 5 weeks, from the issue of December 28, 1931. Wiki link