Canada Day is the national holiday of Canada celebrated annually on July 1. It marks the anniversary of the enactment of the Constitution Act, 1867, which united the three colonies of Canada, Nova Scotia, and New Brunswick into a single Dominion within the British Empire, known as Canada. Canada Day is also known as Dominion Day, the anniversary of Confederation, and the national day of Canada. The name Dominion Day was used from 1879 to 1982. However, since 1983, the holiday has been officially known as Canada Day. Regardless of the name, it is a day of national pride and celebration for all Canadians.