Mansa Musa inherited a kingdom that was already wealthy, but his work in expanding trade made Mali the wealthiest kingdom in Africa. His riches came from mining significant salt and gold deposits in the Mali kingdom. Elephant ivory was another major source of wealth.
Answer:
first and last one is the answer
New aqueducts brought fresh water from hundreds of miles away and Huge tunnels were built for sewer lines.
Because it was propbably a sad time for them to live
