To suggest that slavery played no role in the reasons for Georgia, South Carolina, Texas, Mississippi and Virginia to leave the union is to ignore the historical, written reasons they gave for secession in their Declarations and Articles of Secession. VP of the Confederacy Alexander Stephens who was opposed to secession, but followed the wishes of his state, observed in his speech in Savannah that the cornerstone of secession was the issue of slavery and the natural order was to dominate and enslave the Negro. My great-great grandfather was captured at Ft. Pulaski here in Savannah and spent a portion of the war at Fort Delaware as a prisoner. He was eventually exchanged.
https://www.civilwar.org/learn/primary-sources/declaration-causes-seceding-states