Answer:
in the past our survival instincts were higher and we were likely more adapted to require less water, nowadays we tend to rely on water more as well as the accessibility of it, an example of this dependability is when snow or cold temperatures cause the water to freeze leaving people with a shortage of water, this affects people greatly, much more than it would have in the past likely
The number of black slaves was less. The population as a whole of black slaves grew. A lot of the soil was bad from over-planting so there was less of a demand for slaves thus some would become free.<span />
Korean society was strongly influenced by The Chinese model of society.
