When and Why Did the Culture Revolution Come to an End?

During the cultural revolution, did it have any effect or impact on places like tibet and on some of the minority groups in china? The culture revolution was hugely destructive for minority groups in China. One of the most terrific things was the destruction of temples and monasteries in tibet during the culture revolution. In that period there were perhaps about two million deaths or over the period. And er, it's fair to say that that marks the slow beginning of the last phase of the culture revolution which involves a little bit more opening to the outside world.