Despite the fourteenth amendment, which group was still being denied united states citizenship

Despite the fourteenth amendment the population of African ancestry slaves or not were denied the right to the nationality of the United States, violating section 1 that says " All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside. No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws"