How did the kings of Ghana wealthy

The kings of Ghana became wealthy through controlling trade routes and taxing goods that passed through their territory. They established a monopoly on the trade of gold and other valuable commodities such as ivory, salt, and slaves. This allowed them to accumulate vast wealth and power, which they used to expand their kingdom and solidify their control over the region. The kings of Ghana also taxed their subjects on agricultural products and livestock, further increasing their wealth. Additionally, they maintained a strong military force to protect their wealth and interests, allowing them to dominate the region and maintain their status as powerful rulers.