The Kongo Kingdom emerged as a powerful state in west-central Africa during the 14th century. Located in modern-day DRC, Republic of Congo, and Angola, it reached its peak in the 15th and 16th centuries under Manikongo Nzinga a Nkuwu and his son Afonso I. The kingdom's centralized political structure, diverse geography, and control over trade routes contributed to its rise. However, European contact, particularly with the Portuguese, led to significant changes in Kongo society, including the adoption of Christianity and involvement in the transatlantic slave trade.