The summary is, a meteor will come within 24 hours after America forces Israel to divide its land. It will impact in the Caribbean just west of Puerto Rico on one of the little islands and trigger a massive earthquake and tsunami that will unzip the New Madrid fault all the way from Puerto Rico, up the Mississippi, through Lake Michigan, and up into Canada. The exact end point is uncertain, but there's some belief it may go as far as Hudson Bay, literally splitting the entire continent in half down the middle and preventing any travel from east to west.

Some of that will be due to the massive split that will be opened, and some due to its sheer size of tens of miles (the new river that will be formed by this), upwards to over a hundred in some places. This impact will also trigger a super tsunami believed to be over 200 feet (20 stories) high, upwards of 2000 feet (200 stories) in some places that will utterly ravage the east and gulf coasts, wipe Florida and some gulf and east coast states completely off the map, and forever change the shape and face of America. Even Canada will be massively affected.
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Admin Note: This is a conditional prophecy, and will only happen if the USA divides Israel. So it may not ever happen if the USA is smart and leaves Israel alone. Also, upon further review, there is no tectonic mechanism by which this could happen. If this were to strike near Puerto Rico as predicted, it is more likely to split north and south American in two and trigger the Cascadia faultline rather than the New Madrid as the latter is not connected in any way to the other faults in that region, or anything in the gulf.