Here is Europe before the Black Death struck, full of towns, shops, and businesses for it's citizens.
Then the epidemic started. infectious fleas that were on rats arrived to england on trading ships that are thought to have come from the black sea and had traveled through the Mediteranian
people tried to prevent disease by wearing long pants and using insecticide, staying away from pets and rodents.
The rats spread and infested the town, people only went outside of their houses if it was necessary.
The black death ended up killing about 50 million people., it had originated in central Asia, then spread to surrounding countries such as Europe.
Europe and surrounding countries became overrun with rats and disease. People lie dead in the streets and Economy was as low as it's ever been. It had stayed this way until the issue was solved later on.