more than a hundred slaves in a "room" that doesn't contain 10 people and has no ventilation.
They put them in rooms is sugarcoat, it started with cages for a long time, they even tie them to trees outside and let some of them die in the process. They even use some of them for sport and target practice.
For a country that consist of multi ethnic groups with selfish leaders, to achieve unity even if you travel back in time it would be difficult because the issue didn't start at once it compounded over time and moreover some of the hatred we have for each other was planted by our colonial matters to ensure divide and rule making it easy for them to put us under control.