At the North it was supplemented, often in the same breasts, by the inhumane feeling of personal repugnance toward negroes.

The anti-slave-trade agitation in England also had a contributing influence; and there were no economic interests opposing the exclusion.
At the South racial repugnance was fainter, and humanitarianism though of positive weight was but one of several factors.

The distinctively Southern considerations against the trade were that its continuance would lower the prices of slaves already on hand, or at least prevent those prices from rising; that it would so increase the staple exports as to spoil the world's market for them; that it would drain out money and keep the community in debt; that it would retard the civilization of the negroes already on hand; and that by raising the proportion of blacks in the population it would intensify the danger of slave insurrections.

The several arguments had varying degrees of influence in the several areas.
In the older settlements where the planters had relaxed into easy-going comfort, the fear of revolt was keenest; in the newer districts the settlers were more confident in their own alertness.

Again, where prosperity was declining the planters were fairly sure to favor anything calculated to raise the prices of slaves which they might wish in future to sell, while on the other hand the people in districts of rising industry were tempted by programmes tending to cheapen the labor they needed.
The arguments used in South Carolina for and against exclusion may be gathered from scattering reports in the newspapers.