A commercially successful steamboat :)
Ming Emperor Hongwu (Ju Yuanzhang) became emperor after the mongols were driven out of China.
Hope this helps! :D
The answer should be John Smith
The Reasons for the migration of the Bantu are not known but they most likely included the following, they moved due to the fear of famine, which broke out due to overcrowding and drought. The climate in their cradle land had become unreliable/unpredictable.