The first premier of Newfoundland and Labrador, Joey Smallwood, coined the term Atlantic Canada when Newfoundland and Labrador joined Canada in 1949. He believed it would be presumptuous for Newfoundland and Labrador to assume that it could include itself within the existing term "Maritime Provinces", used to describe the cultural similarities between Nova Scotia, Prince Edward Island, and New Brunswick. The three maritime provinces joined Confederation in the nineteenth century: New Brunswick and Nova Scotia in 1867 and Prince Edward Island in 1873.
Occasionally, the Maritimes is used as a synonym for the Atlantic provinces, but this usage is considered incorrect as the former generally excludes Newfoundland and Labrador.