This is a carousel. Use Next and Previous buttons to navigate PRATTVILLE, Ala. (AP) — There’s no painless way to explain the history of a massive brick structure being renovated into apartments in this central Alabama city — a factory that played a key role in the expansion of slavery before the Civil War. Dating back to the 1830s, the labor of enslaved Black people helped make it the world’s largest manufacturer of cotton gins, an innovation that boosted demand for many more enslaved people to pick cotton that could be quickly processed in much higher quantities than ever before,...