Why the Founding Fathers chose slavery

"Why did the Founding Fathers accept slavery in the new country? Basic politics, or something more?" --Ken ► SCRIPT CORRECTION/FEEDBACK: Also, regarding Thomas Jefferson fathering children with Sally Hemming, some here are giving me pushback on that, claiming it's not settled. There's still a bit of dissension on that, so yes, I should've added a "likely" qualifier. There's a decent amount of evidence, between DNA showing "a" Jefferson was the dad of one. Combined with other facts, tha...