Which factor most encouraged the growth of this trade

The profitability of cash-crop agriculture (farming). Cash crops like tobacco, rice, & sugarcane demanded lots of labor, which led to tens of thousands of enslaved West Africans being imported into the colonies by way of the Triangular Trade.

The case was a u.s. supreme court decision that defined the scope of the u.s. congress's legislative power and how it relates to the powers of american state legislatures. the dispute in mcculloch involved the legality of the national bank and a tax that the state of maryland imposed on it.