The place is called Martha's Vineyard, an island off the coast of Massachusetts in the United States. In the 18th and 19th centuries, a high percentage of the population on Martha's Vineyard had hereditary deafness, leading to an unusually high rate of sign language fluency among the community members.
The name of the place where at one time almost everybody knew sign language is Martha's Vineyard. Martha's Vineyard is an island located south of Cape Cod in Massachusetts, USA. In the 18th and 19th centuries, a high incidence of hereditary deafness gave rise to a unique sign language community on the island, where both deaf and hearing individuals communicated using sign language.
