The african state that played a very active and profitable role in the transatlantic slave trade was the

 This is taken from THE GLEANER, article AFRICA'S ROLE IN SLAVERY.

In the Arab world, which was the first to import large numbers of slaves from Africa, the slave traffic was cosmopolitan. Slaves of all types were sold in open bazaars. The Arabs played an important role as middlemen in the trans-atlantic slave trade, and research data suggest that between the 7th and the 19th centuries, they transported more than 14 million black slaves across the Sahara and the Red Sea, as many or more than were shipped to the Americas, depending on the estimates for the transatlantic slave trade.

The inescapable fact that stuck in my craw was: My people had sold me ... . My own people had exterminated whole nations and torn families apart for a profit before the strangers got their chance at a cut. It was a sobering thought. It impressed upon me the universal nature of greed." And we might add, the universal nature of slavery.

African kings were willing to provide a steady flow of captives, who they said were criminals or prisoners of war doomed for execution. Many were not, but this did not prevent traders posing as philanthropists who were rescuing the Africans from death and offering them a better and more productive life.

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.