Shi Huangdi was an effective leader because he was the first Chinese emperor that managed to unite the northern China and responsible to the first development of China's great wall.
Not only that, he is also the one that introduces China to the usage of money as a medium of transaction.
The answer to the question above is the Mali Empire became the world's largest producer of gold and Mansa Musa spread the Islam on Mali Empire.
The effects of Mansa Musa's rule on Mali Empire and West Africa is the Mali Empire became the world's largest producer of gold. He also spread the Islamic religion on Mali Empire and he made a pilgrimage to Mecca.
It was the first Southern state to leave the Union and the first shots to start the Civil War was started in south carolina.
Hope this helps! :D
