Most famous comedians are black due to a number of reasons. This is because black people by nature tend to be funny. The way they speak and let their thoughts out in a humorous way, is totally unique and is very different from the rest of the lot. This allows them to stand out.
Moreover, black people tend to have varying levels of negative experiences which includes racism. With ease, they are able to add sarcasm and dark humor into such experiences so as to let their anxiety out. This makes them the best at what they do and allows others to relate.