This also was a mammoth of a White propaganda piece with regard to the International Relations of the U.S., as the world thought that U.S. Slaves were being freed. It must be clear that since White People were already U.S. Citizens by human mutuality, not by legislated Civil Rights in which they had no choice, The 14th Amendment could not have been written for them. A discussion of White immigrants is not germane. We are discussing U.S. Slavery, about U.S. Slaves. There would be no reason to restate this in an Amendment to the U.S. Constitution.
Slaves are captives.
The Law is subject to you if you are free, consent of the governed. Slaves are subjects to the Law via forced jurisdictional association. Here is an admission that there are both free Persons and subjects. So, White indentured servants were given their liberties in 1776 via U.S. Public Law to which they are parties. These are slaves, Africans.