Final answer:
The trans-Atlantic slave trade was the most important development that impacted Africa during the 1600 to 1800s, resulting in profound social, political, and economic consequences.
Step-by-step explanation:
The most important development that impacted the African continent during the 1600 to 1800s was the trans-Atlantic slave trade. This trade involved the forced enslavement and transportation of millions of Africans to the Americas, resulting in profound social, political, and economic consequences for Africa. The slave trade led to the rise of powerful states that engaged in warfare to dominate the trade and destabilized regions in Africa.