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.
Because of the discovery of gold in San Francisco in 1848, many people began moving west to search for wealth and fame. The United States was discovering many things underground...gold, silver, and oil. These were some of the natural resources the United States had at the end of the 1800s.
