ROTFLMAO
Another irony, is yes it was true that most Americans beleived blacks to be subcreatures, but it was the South that lobbied to count them a full human beings for the census, and the North that lobbied to ignore them totally as being only subcreatures. That is where the 3/5 compromise came about. This racist proportional human rating was not the Souths doing, but the best that they could do vs a racist North.
You manage to make it sound like the alutristic south vs. the intolerant North. What you forget is that the south wanted slaves counted in the census. Slaves, without any status in southern states other than property. Slaves, who couldn't vote and were not even considered citizens in southern states. And the reason why the southern states wanted them counted the same as a free person was for the purpose of padding the census count and gaining congressional representation. So the southern states wanted to use the slave population, not protect their rights. In the southern states they didn't have any.