Incorrect. Read the Civil Rights Act of 1866:
"Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That all persons born in the United States and not subject to any foreign power, excluding Indians not taxed, are hereby declared to be citizens of the United States"
Were ALL blacks non-citizen slaves in 1866?
If you answer yes, then you are ignorant beyond belief. Also, you underline the word “born” but that is not the defining word for citizen, the definition for citizen comes via “not subject to any foreign power”. The US Constitution never denied citizenship to blacks born in the US, the pro-slavery states did that dirty deed. However, blacks living in the abolitionist states were always considered citizens and members counted for representation in Congress. You see the slave states wanted to count the slaves for representation, but since they considered them property, the abolitionist states said, well if they get to count their property, so do we and since the abolitionists were wealthy and had a lot of property, i.e. chairs, tables, lamps, etc, their representation would have been through the roof. Thus the pro-salvcery states settled for a compromise which is the 3/5 ths clause. Until they freed the slaves and recognized them as persons rather than property, the slave states lost out on full representation in congress. Slaves owed no allegiance to any nation, they owed servitude to their master and thus was under the allegiance of the master. Therefore, when they were freed and the 14th was passed, their rights as “born” citizens could not be refused. It might behoove you to actually read & study history before expounding on that which you do not understand.