Slavery was why the north and south were fighting, so it would be slavery
His teaching of the theory of evolution lead him to be arrested, as this broke a Tennessee state law. The AFT supported him, as he was willing to challenge government interference in with the science curriculum.
I believe it is the 1st one but may be the 2nd one.
The board controlled Georgia for 20 years, no self-government provision was established in the charter. The trustees set up several policies to to check expansion and development including land restrictions, prohibiting alcohol, prohibiting slavery and the Indian Act.