We finally decided to fully isolate ourselves. We finished building The Wall about 200 years ago. The provinces around us began to collapse shortly thereafter. It all started when their food and water supplies became tainted. There was widespread disease and starvation, and their economies slowly fell apart. Riots followed, then wars. We assume there were some survivors, but we have no idea how many. That was decades ago. We no longer know what life is like outside of these walls, but I will soon find out.