Was there a place in 1830 where every black in every state was enslaved?

Yes, in 1830, slavery was legally practiced in many states of the United States, primarily in the South. While not every black person in every state was enslaved—free black individuals existed, particularly in Northern states—enslavement was widespread, and millions of African Americans were held as slaves, especially in states like Virginia, South Carolina, and Mississippi. Thus, it was a period marked by the systemic enslavement of black individuals in a significant portion of the country.