Final answer:
The lasting effects of slavery include racial divisions and inequality in the Americas and the establishment of colonial borders in Africa that have influenced ethnic tensions and conflicts.
Step-by-step explanation:
The institution of slavery has had a profound and lasting impact on the world, even after its abolition. Racial divisions and inequality, particularly in the Americas, are direct legacies of slavery. This entrenched social inequality is evidenced through discrimination in areas such as housing, education, and employment that continued long after emancipation. The economic benefits derived from slavery also led to deep sectional divides in the United States, contributing to the Civil War. Furthermore, slavery and the subsequent colonial borders established in Africa have had lasting effects on political and social structures on the continent, facilitating ethnic tensions and conflicts. In response to the question, the best answer would be A. It created lasting racial divisions and inequality in the Americas.