Looks like a good idea on the whole, at least as far as North America and the Caribbean go. The big port cities of the time -- Havana, Philadelphia, Boston, Rio, and New York, did not become so by accident or caprice. They were excellent natural deep-water harbors, almost always on navigable rivers. They held immense value, and that value should be represented in-game. Perhaps they should not be important centers of trade, with the full +20 to trade power, but at least a +10 river estuary modifier would be appropriate. I don't really see "Estuary" in EU4 as requiring an actual estuary -- it's just a way of denoting the approximate mouth(s) of a navigable river without the various other factors that allowed or would have realistically allowed that province to become a major trading center.
Also, much as I love New York City, it did not become the dominant East Coast port until the opening of the Erie Canal, which gave New York City easy access to the Midwest and Canada via the Great Lakes. So it shouldn't be the only province with trade bonuses in the Chesapeake node, because that's just silly.
Perhaps for areas with deep-water harbors that are not technically estuaries of major rivers (like Boston or Havana), the wording could be "This province contains an excellent deep water harbor" instead of "This province controls the (river name) estuary", but still give the same bonus. That would actually probably be better than scattering around a whole bunch of "Important Centers of Trade" in unsettled areas. Perhaps something similar could be done for important but unsettled inland centers as well, like St Louis or Montreal "This province controls an important river confluence"
I definitely like this idea. It would give bonuses to non-settled provinces without them being "Important Centers of Trade", which does seem a bit over the top before they are settled.
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