Which african kingdom had kings, called mansas, who controlled the gold mining and salt supplies in west africa?

Government powers not provided to the national government in the us constitution but are rather given to the states by the 10th amendment is called?

John locke viewed the social contract as a choice or "consent of the governed", where the people possess the power to change government. how did thomas hobbes see the social contract? man is born in chains, but can be set free through good deeds. man is born happy, but becomes more miserable as he ages. man is born poor, but can rely on other individuals for security. man is born selfish, but can give up some freedom in return for security provided by the government.

In witch form of government do delegates speak on behalf of citizens