The forces that ended slavery seemed to the speaker to be deeper and less contingent than the hypothetical historical scenario under discussion.

“of slavery being a much more enduring institution a thousand years later that seems not true to me like the forces that led to the end of slavery seemed like they were not like they were not contingent forces they seemed like deeper forces than that and if you're saying well if we like if we aligned as today to some bad set of values then that could affect the future in some ways which are more fragile that”