The similarity between the rise to power of both the Kingdoms of Ghana and Songhai during the postclassical era is D. Both developed economic power by controlling valuable trade routes.
<h3>What is a Government?</h3>
This refers to the entity or mechanism that is in charge of the affairs of a country or nation.
Hence, we can see that based on the history of both kingdoms, they understood that who controlled trade, controlled the government so they seized power by controlling trade routes.
Read more about the Kingdom of Songhai here:
brainly.com/question/3468214
#SPJ1
