After the fall of civilization, most of the areas in Western Europe took on a medieval aesthetic. Whether this was because of its deep rooted traditions and long history or the result of meddling is hotly debated by the few sociologists that still live in the area. The areas that used to be France and Spain embody the middle ages more than any other part of Europe. The Italian Peninsula has more of a renaissance feel to it. Switzerland is a notable exception to this rule and to most other rules of the world at large.
Throughout most of Western Europe, the people still culturally identify as being part of the pre-fall nations that would have included their homes. politically, though, the landscape is very similar to the city states of modern North America or Ancient Greece. At times, some of the city-states have formed temporary alliances to resolve conflicts, but for the border cities an alliance is as likely to cross the old national lines as it is to follow one.