The population increased as soldiers were returning home
The port authority of New York and New Jersey
One of the major ways in which the early West caused a cultural transformation in the United States is that it led to a mass migration of settlers, both interested in incredibly cheap land and sometimes gold, which created a "frontier" culture in the US that was very different from city life.
The main reason for Virginia to established might be of profit, it was founded to provide the English territorial claims to America and to provide a colonial market trade. It had strictly commercial porpuses, it dealt with tobacco and crops for export and also trades.