Most Vincentians are the descendants of African slaves brought to the island to work on plantations. There also are a few white descendants of English colonists, as well as some East Indians, Carib Indians, and a sizable minority of mixed race. The country's official language is English, but a French patois may be heard on some of the Grenadine Islands. St. Vincent has a high rate of emigration. With extremely high unemployment and under-employment, population growth remains a major problem.