Why were the English so concerned that James II had a son?

The English were so concerned that James II has a son because this meant that a Catholic succession was now assured which was opposed by most of the English.

Just think, why was it effective? -it appeled to critics because it was written well, that made it noticeable to the public including the white population-it was also recognizable to the african americans because it was about their heritage.-it was powerful just keep finding more points and elaborate on them. message me if you need more