You have yet to demonstrate an understanding of anything, Least of all the topic being discussed.
Again, explain to me why Slaves and Indians were not citizens if the rule is simply being "born here." WHY DID THEY NOT FIT THE CRITERIA OF NATURAL BORN CITIZEN?
Because slaves were property and not legally persons and Indians were born of independent nations and therefore not under the jurisdiction of the US government.
The simpler answer is that the founding fathers did not want slaves and Indians to be citizens.