Canada Day celebrates the anniversary of the Constitution Act's entry into force on July 1, 1867 (formerly known as The British North America Act, 1867). The Act was created to unite three separate colonies of Canada, Nova Scotia and New Brunswick into a single Dominion within the British Empire called Canada. Much of the operation of the Government of Canada (i.e. its federal structure, the House of Commons, the Senate, the justice system, and the taxation system) are defined in the Act. Canada Day originally was called Dominion Day / Le Jour de la Confédération, and only in 1982, the year the Canada Act was passed, it was renamed.