What were the causes and effects of the beginning of importation of african slaves into the americas?

The importation of African slaves into the Americas effectsly affected the Americas. In the United States, the acquaintance of slaves drove with a conviction of a "mediocre" race which penetrated southern culture for a long time. As a result of subjugation, numerous southerners couldn't envision a general public where whites and blacks lived as equivalents. It prompted major financial contrasts between the North and South.

The answer would be a