Celebrate Canada Day with Us... Canada Day , formerly Dominion Day, is Canada's national day, a federal statutory holiday celebrating the anniversary of the July 1, 1867, enactment of the British North America Act (today called the Constitution Act, 1867), which united two British colonies and a province of the British Empire into a single country called Canada. Canada Day observances take place throughout Canada as well as internationally. In This Application you may Find: Etymology History Government & Politics Law Foreign Relations & Military Provinces & Territories Geography and Climate Science & Technology Economy Demographics Culture Language International Rankings National Anthem Visit Canada