<span>were given names made up of three or four letter acronyms</span>
Trans-Saharan trade requires travel across the Sahara between sub-Saharan Africa and North Africa. While existing from prehistoric times, the peak of trade extended from the 8th century until the early 17th century. ... Cattle were introduced to the Central Sahara (Ahaggar) from 4000 to 3500 BC.
Although polarization drives some improvements towards democratization and political scientists show that politicians support polarization, divisions have become more one-sided.
