"The Kingdom of Dahomey became a major power in the Atlantic slave trade..."

"... with slaves supplied through raids of surrounding areas.  Oyo would sometimes put pressure on Dahomey to decrease their slave trade, largely to protect Oyo's own trade, which would slow the trade for a while before it increased again...."

The place that was the Kingdom of Dahomey is now called the Republic of Benin, and it is today's "History of" country. The French took over circa 1870, and the finally let go in 1960:

Between 1960 and 1972, a succession of military coups brought about many changes of government. The last of these brought to power Major Mathieu Kérékou as the head of a regime professing strict Marxist-Leninist principles. By 1975 the Republic of Dahomey changed its name to the People's Republic of Benin. The People's Revolutionary Party of Benin (PRPB) remained in complete power until the beginning of the 1990s. Kérékou, encouraged by France and other democratic powers, convened a national conference that introduced a new democratic constitution and held presidential and legislative elections....