I came across a story ID request here recently, that reminded me of another similar story I've read.
The story I've read, most likely in '90s or the late '80s, portrays the history of how the USA got an inland sea.
A previously ignored — presumably minor — fault line turns out to be bigger than previously thought. A series of earthquakes follow and a large part of the central USA sinks below sea level, creating an inland sea.
The point of view in the story is looking back, telling the story of how the inland sea came to be, with dramatic losses, but that overall it turned out to be a boon for commerce and tourism.