The Hudson Bay would have been facing one hemisphere of Mars all the time and this hemisphere lost crustal material in this configuration. This is why one hemisphere of Mars has less crust than the opposite hemisphere.
Whether the Mars - Earth axis rotated is debatable. Perhaps only occasionally would this axis line up with the Sun. If Jupiter or Saturn or both lined up with this Sun - Earth - Mars axis then huge electrical currents might have flowed then. In my theory this would have been responsible for the major destructions like the dinosaur extinction and also for the production of the oceans.
So Mars - Earth was where the asteroid belt is now and the asteroids were formed from the Mars material and the Earth material which came from where the oceans are now. After the break-up of this configuration Earth went into a very elliptical orbit and when near the Sun, around where Venus is now, say, there was lots of evaporation and transport to the polar regions where ice was formed. This produced the ice ages. So the Younger Dryas was caused by an interaction between Earth and probably Mars that caused Earth to go in a much more circular orbit. This produced the 30 degree pole shift through the land from the Hudson Bay area to the present location. There were more interactions like Noah's flood and repeat interactions with Venus which stablised both orbits.