I got transmigrated into the body of a plantation owner

John White, An average African American living in the 21st century has suddenly found himself transmigrated into the body of a plantation owner who appears to be living in some version of late 1800's America. However, to his surprise, this world, instead of functioning on technology and automation, relies entirely on magic. What's more surprising, however, is that everyday magic is powered by the mana of slaves. In this world, mana is a commodity of sorts, an unofficial currency, some would even say. Every man and woman is born with a certain amount of mana inside their body that'll always regenerate if they use it to power some sort of spell! But in this world, mana can be stolen from an individual. In this world, there are things called mana plantations, and inside them are poor individuals who are forced to give up their mana each and every day, leaving their bodies in a constant state of exhaustion. John White has found himself in the body of one of these plantation's owners. How will he adapt to his new body and overcome the trials this new world has to offer?