What major changes took place in canada in 1931 and 1982?

On December 11, 1931, Canada acquired full legal autonomy from Britain. It was the date that the Statute of Westminster was passed  that established the Crown Dominion of Canada as independent of the British Parliament. Despite being granted the right to govern itself way back in 1867, Canada did not enjoy  full  legal autonomy until December 1931.

In 1982, Canada took the last step to become a totally independent country that could legally amend its constitution instead of depending on Britain in any way. It was Canadian Prime Minister Trudeau who helped bring in the final change.