A Key into the Language of America or An help to the Language of the Natives in that part of America called New England is a book written by Roger Williams in 1643 describing the Native American languages in New England in the 17th century, largely Narragansett, an Algonquian language. The book is the first published colonial study of a Native American language in English.
Williams was one of the founders of the Colony of Rhode Island and an exile from the Massachusetts Bay Colony. The book was in part written to halt Massachusetts Bay's claims to Rhode Island's territory. Williams also argued against confiscating Indian land, arguing that the Indians had a right to payment. He had personally interacted with the Narragansett and the Wampanoag tribes as a missionary, friend, and trader, and he wrote favorably about elements of their culture. The book helped to introduce a number of American Indian loan words into the English lexicon.
