The North Carolina General Assembly first prohibited anyone from teaching slaves to read or write in 1818, then strengthened the law in 1830 (in the bill reprinted here).
The following year, another bill made it illegal for not only slaves but free people of color “to preach or exhort in public, or in any manner to officiate as a preacher or teacher in any prayer meeting or other association for worship where slaves of different families are collected together.”