Africa and its people are the most written about and the least understood of all of the world's people. This condition started in the 15th and the 16th centuries with the beginning of the slave trade system. The Europeans not only colonialized most of the world, they began to colonialize information about the world and its people. In order to do this, they had to forget, or pretend to forget, all they had previously known abut the Africans. They were not meeting them for the first time; there had been another meeting during Greek and Roman times. At that time they complemented each other.