Oh crap, billbears. We've been down this road time and again and every time you get challenged you toss out wild-ass guesses as to why you claims don't hold water. Grandfathered in Illinois? The number of free blacks rose 50% between 1850 and 1860. If your claim was true then that number should have remained constant or declined. Like the way the number of free blacks declined in Mississippi and Arkansas during that period. Nobody is denying the Oregon Constitution, but you mention Virginia which had a Constitution that required any slave freed in the state to leave within 12 months or else face being sold back into slavery. Sure Virginia had 58,000 free blacks in 1860. In 1850 Virginia had 54,000 so during the same period that the free white population was increasing 25% the free black population increased 7%. During the same period the free black population in Illinois was increasing 50% the free black population in Mississippi decreased by 20%. So if the North was the one with these restriction why wasn't the free black population in the south growing? The slave population sure was.
If your claim was true then that number should have remained constant or declinedIt's not my claim, it was the law at the time. As for this population 'explosion' that you claim, if you would bother to look at the native-born numbers, you'd find that of the 7,628 blacks you are so happy to wave around, only 70 were not native born. So apparently blacks were having babies during the decade of which you speak (I know that's going to come as a shock to your lincoln myth of the ever busy underground railroad) and the population growth from immigration is not 50% but only .9%.
We'll not even get into the numbers of free black population between the ages under one year to fourteen. For the number of free blacks in that age frame, for your number of 50% growth by immigration they all walked there by themselves, even if they weren't born yet!!