No - Indians were never deemed to be Americans. They were to be members of sovereign Indian nations. Hence the requirement to be naturalized as American citizens.
Again, you aren't getting the point. The CHILDREN of Indians were not granted automatic 14th amendment citizenship. Yet the CHILDREN of other "Sovereign Nations" were granted citizenship.
If the rule is "birth on the soil" then why did it apply to the children of European Nations, but not to the children of Indian Nations?
Obviously "birth on the soil" was not the deciding factor. I bet you still do not "get it."