Here's my scenario about what's going to happen: The Cascadia Fault liquefies the US Pacific Coastline from Puget Sound south to Half Moon Bay in California. This upsets the equilibrium of the San Andreas Fault and everything from Sandy Ego to Frisco falls into the ocean. Naturally this has upset the geoplastic equilibrium of everything west of the Mississippi and since New Madrid, Missouri is on the western bank of The River, the New Madrid Fault kicks off a quake that's felt in Augusta, Maine. Various things happen, including a slide of the southern edges of the Great Lakes. Without a southern edge, the Great Lakes wash over the central and eastern US, washing Canada over that area. The property losses are, of course, quite astronomical. The US becomes a country consisting of States west of Wichita, Kansas to what was the California/Oregon/Washington eastern borders and a pinch of States in the vicinity of Maine. But! Canadians are nice folks, polite and all, and a couple of years after The Big Disaster they load up dump trucks and haul their nation back North.
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