The two small cities that emerged on the New Hampshire side of the Piscataqua River ultimately found themselves rivals.

While Dover, hidden upstream, developed earlier and had much of early Maine on its side, Portsmouth took on its own character.

Portsmouth had a harbor, for one thing, and as waters upstream became polluted with sawdust from the mills, along with the clearing of forests miles inland from the banks, Dover’s wharves and landings faded in importance. Its goods were relegated to small local vessels called gundalows, which could maneuver the shallow waters, and then repacked into larger ocean-going vessels rather than continuing directly.

All of that then had Portsmouth emerging as the focus for trade, connecting it to towns up and down the Eastern Seaboard and beyond rather than anything much inland.

The center of Dover, meanwhile, kept creeping upstream from its waterfront origins at Hilton Point. Its outlook turned increasingly up-country, powered by the waterfalls along the Cochecho River and the mills, along with farming and timbering.

It was a common pattern in New England, so I’m told. The merchant class of the harbor settlements kept informed on activities along the coastline and destinations overseas but knew little to nothing of what was happening just five miles inland. The inland points, for their part, had little interest in distant locales.

By the time of the American Revolution, Portsmouth boasted of some impressive Georgian houses owned by wealthy seagoing merchants, some of them signers of the Declaration of Independence. (The squalid, roughnecked, red-light neighborhoods that went with all that seagoing were left more unspoken.) Dover was far more modest, about 50 years away from emerging as a major textile manufacturing center, with the red-brick mills.

George Washington visited Portsmouth but not Dover. You get the picture.

The character of the two communities continued to diverge after that, and they still do. Today, Portsmouth is driven in large part by tourism, both as a destination and as a stopping off point for almost all of the motor traffic in and out of Maine. In contrast, Dover sits quietly to the north, though the new bridge at Dover Point makes the place more accessible.

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The other two towns of New Hampshire’s first century also had different personalities.

While Hampton sat on the Atlantic coastline, it lacked a harbor. Nor was it inland enough to have the waterfalls to power manufacturing. Its base remained agriculture.

Exeter, further inland, did have the falls but somehow also took on a more cultured tone. It’s a story I anticipate hearing of more.

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I was often puzzled that so few folks in Portsmouth knew anything about Dover, just a dozen or so miles away. Not so for Dover residents when it came to Portsmouth, the smaller of the two.

That just may be changing, however, with the downtown renaissance in Dover and the increasing commercialization and crowding of Portsmouth from the funky, artsy edge we so enjoyed just 30 years ago.

The one thing that hasn’t changed from the late-Colonial era is that Portsmouth remains more monied. Some of that, at last, just may be migrating northward, toward family-friendly Dover.