That is not the case in which the Supreme Court decided that according to the 14th Amendment children born in the United States of illegal aliens are U.S. citizens.
I do not have time to do your research, so you will have to find it yourself.
Justice Miller was a contemporary of those who drafted the Amendment and had immediate access to those who wrote it by which to interpret the law. Thus your claim of superior knowledge of its original intent is refuted by his.
Maybe you'll accept the Congressional Globe?
"Every Person born within the limits of the United States, and subject to their jurisdiction, is by virtue of natural law and national law a citizen of the United States. This will not, of course, include persons born in the United States who are foreigners, aliens, who belong to the families of ambassadors or foreign ministers accredited to the Government of the United States, but will include every other class of persons.