One reason why I think Europe is perhaps a bad inspiration for PoL is because Europe is so freaking small. Let's look elsewhere for inspiration: the Americas.
Now, I don't know at what point in Coloniel America you reached "City" size. But much of North America was a pretty damn big ? across the map (from the perspective of the Europeans, at least). The North American continent is huge; even if you plopped a few cities down, travel between them would be so long (and in some cases treacherous) that it would definitely stifle trade, communication and protection. If you had a city in central Canada, one in the Southwestern United States, and one on the Eastern Sea Board (all established by settlers or a united native population), you'd have a big fat PoL between them.
Another source of inspiration is, again, the Americas but in this case South America. You had fairly big civilizations in Latin America - the Mayans, the Aztecs, etc. Then came Cortez, who smashed that to pieces. Now, imagine the post-Cortez Latin America, where the people are trying to put themselves back together. Lower population, emptier cities, long swaths of land unprotected.
One potential Cause of the PoL would be decaying of communication/travel. If there were a few established Roads, even groups who defended those Roads, or means of quicker travel - and society at large built up and up while taking advantage of this - then if it Went Away... You'd have a larger population, struggling, and suddenly In the Dark about news. Trade is cut off, and so on.
A non-PoL setting going suddenly to PoL is rife with hooks. Particularly if the transition was fairly recent. As suggested above, you could have a city that just got cut off from its ways of sustaining itself (trade, food, etc). So the city now too big for its britches is an interesting setting for an adventure!
Now, I don't know at what point in Coloniel America you reached "City" size. But much of North America was a pretty damn big ? across the map (from the perspective of the Europeans, at least). The North American continent is huge; even if you plopped a few cities down, travel between them would be so long (and in some cases treacherous) that it would definitely stifle trade, communication and protection. If you had a city in central Canada, one in the Southwestern United States, and one on the Eastern Sea Board (all established by settlers or a united native population), you'd have a big fat PoL between them.
Another source of inspiration is, again, the Americas but in this case South America. You had fairly big civilizations in Latin America - the Mayans, the Aztecs, etc. Then came Cortez, who smashed that to pieces. Now, imagine the post-Cortez Latin America, where the people are trying to put themselves back together. Lower population, emptier cities, long swaths of land unprotected.
One potential Cause of the PoL would be decaying of communication/travel. If there were a few established Roads, even groups who defended those Roads, or means of quicker travel - and society at large built up and up while taking advantage of this - then if it Went Away... You'd have a larger population, struggling, and suddenly In the Dark about news. Trade is cut off, and so on.
A non-PoL setting going suddenly to PoL is rife with hooks. Particularly if the transition was fairly recent. As suggested above, you could have a city that just got cut off from its ways of sustaining itself (trade, food, etc). So the city now too big for its britches is an interesting setting for an adventure!
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