Final answer:
Mansa Musa enlarged the Mali empire and made merchants pay him taxes.
Step-by-step explanation:
The person who enlarged the Mali empire and made merchants pay him taxes was Mansa Musa.
After the empire of Mali was created by Sundiata Keita, Mansa Musa, who ruled from 1312-1337, continued to expand the empire. He extended the empire to include Timbuktu and territory westward to the shores of the Atlantic Ocean.
Mansa Musa made merchants pay taxes, and he became incredibly wealthy through trade in gold and salt. He is best known for his pilgrimage to Mecca, during which he distributed gold and gifts that caused inflation in Egypt.