Thomas Jefferson. Now I just have to make this "at least 20 characters to explain it well". I'm not entirely sure how to explain Thomas Jefferson more though.
The growth of Sub-Saharan African Kingdoms was assisted by Agriculture and Trade. Increase in trade routes led to increase in transportation that played a major in increasing the trade activities that led to flourishing of these kingdoms, the major exports included slaves, gold, copper and animal products such as ivory, pelts, feathers and tortoise shells.
He wasn’t sure he had the legal authority to make the deal because the constitution didn’t confer about authority for acquiring territory.