Canada, officially the Confederation of Canada was a sovereign state that existed in North America from 1867 to 2064. Beginning as a dominion within the British empire, became more autonomous in the 20th century and was a great power by the mid 21st century with the world's fourth largest economy, recoginition as a nuclear weapon state and a permanent seat in the UN Security Council. In 2064, it was annexed into the North American Union.