A Chance For Ago

Thousands of years ago an inland ocean covering Manitoba, Saskatchewan, North Dakota and Montana smashed through a mile high wall of ice and with a roar of constant thunder that could be heard for 200 miles the water exploded into the Arctic Ocean. Some scientist say that this was Noah's flood.
That was then. This will happen.
Freed of the crushing weight of the Everest of ice, the land is rising and slowly blocking all the rivers draining into Hudson Bay.
Those lakes are getting bigger.
Those lakes are coming south.
Those lakes aren't shaped like teardrops for nothing.