it was way bigger than most cities & had paved streets :)
They could have come up with a paid labor system as well as invest in mechanical that would have revolutionized agriculture.
Breaking down the money that was used to buy slaves, and finance their travel,food and accommodation, one have enough money to pay labor, even though minimum wage for some several years. The problem have to do with the notion of supremacy and savageness that characterized the whole of humanity in that era.
Confirmation bias happened when a personal belief and desire are directly influenced. It is something like that when p[people want to confirm that it is true and they believing it that it is confirmed true. In this situation, we believe that information that we believe even we ignore other information that confirms it doubtful.
It indicates that we do not see the situation objectively but we see it subjectively so the belief is biased. Even we pick that data that feels us happy and confirmed our prejudice. It is also found in an anxious patient who always seeks that the world is in danger.