Which document announced Canada's independence from Great Britain?

The document that announced Canada's independence from Great Britain is the Constitution Act of 1982. This act marked a significant turning point in Canada's legislative independence by patriating the Constitution, which means that Canada took full control of its constitution from the British Parliament. It included the Canadian Charter of Rights and Freedoms, further solidifying the country's commitment to democracy and individual rights.

While the British North America Act was crucial in establishing Canada as a self-governing dominion within the British Empire in 1867, it did not provide full independence, as many legislative powers remained with Britain. The Statute of Westminster in 1931 did enhance Canada's autonomy by allowing it to make its own laws without British interference, but it was the Constitution Act of 1982 that fully completed the process of independence. The Magna Carta, while an important historical document regarding the rule of law, does not pertain to Canada’s independence.