Which factors in west and east africa allowed their cultures to endure?

The cultures of West and East Africa could manage to endure due to international trade which brought access to European textiles and metal goods. New food crops were also introduced to these lands and agriculture maintained on a stable and hight level. All these factors enabled the endurance of these cultures.

the national congress's powers over the states were specific and definite: it had the sole power to negotiate treaties, declare war, and make peace. all powers not granted to congress were reserved for state governments. congress had no power to levy taxes, for example.