The Missouri River would have flowed north across Canada. There would be no Hudson’s Bay. The Ohio River would not exist. Instead the “New” River of West Virginia would have flowed north to the St. Lawrence. There would be no Great Lakes.
The British colonies would have remained hemmed in along the Atlantic. There would be no easy access to the Mississippi and the interior might well have remained solidly French. If you did somehow get to the Mississippi, there would be no Missouri River to take you to the Rocky Mountains. There would be no Detroit, Chicago or Milwaukee.
