it was to make the then slaves American citizens, it was never meant to naturalize illegals, as they are not citizens and therefor are not under the jurisdiction of the US but the country they came in illegally from. Even native americans did not qualify as they were under tribal jurisdiction.
i also find it funny how now the left is concerned about the constitution all of a sudden.
There really is no need to create a straw man argument. The point of contention here doesn't seem to be about changing the Constitution, it's about overriding the Constitution with an Executive Order. That's obviously a much different story even if you try to cast it as something else.