Tribes were no longer considered to be independent nations.
House of representatives and senate because they are the legislature and the legislature make the laws
B) They had a complex civilization that was destroyed by the Spanish conquerors.
By the time of the Spanish invasion, the Aztecs had devloped a strong civilizations, they had a system of trade & commerce and were quite wealthy. They also had a primitive form of "police" and a banking system.
His pilgrimage to Mecca, as he was so devoted to his mission and was very generous with the surplus amount of gold that Mali had, it became very apparent to the rest of the Muslim world that the Mali Empire was one to be taken seriously.