In the ancient world, why did civilizations flourish around great river valleys? River valleys protected citizens from natural disasters.
River valleys provided an ideal environment for agriculture.
River valleys sheltered citizens from harsh weather.
River valleys contained vast mineral
resourges

In the ancient times ofcourse even now agriculture is main occupation for people. around river valleys fertilility of land is very high and there will be easy transportation

Explanation:

pan-africanism or pan-africanism is a political, philosophical, cultural and social movement that promotes african twinning, the defense of the rights of african people and the unity of africa under a single sovereign state, for all africans, both africa as of the african diasporas.