When did the black plague finish?
That kinda depends. Some historians argue about what disease the black death was, and argue if it’s the same disease in each outbreak. But if we presume it is the same disease, the last major outbreak in Britain was 1665, but there were outbreaks in other parts of Europe for some time after that. Provided you agree that the black death was the bubonic plague (and some historians argue that it wasn’t), then you should note that it still exists. Mostly in labs, but there are a few places in the world where it exists in the wild.