Why did slavery grow in the south but die out in the north?

Slaves are mostly use to tend the plantation. The South need more slaves when the amount of plantation increased as time pass. The North turn to factory as time pass which mean less slaves is needed.

mount st. helens in washington erupts, causing a massive avalanche and killing 57 people on this day in 1980. ash from the volcanic eruption fell as far away as minnesota. seismic activity at mount st. helens, which is 96 miles south of seattle, began on march 16.