What did timbuktu contribute to mali importance as a kingdom

Timbuktu was important as an area of vigorous trade.

Timbuktu was a city in the kingdom of Mali. During the 12th century, serfs and goods such as gold, salt, and ivory were among the prime commodities of trade. This city was established as a scholarly center in Africa.

The empire of Mali was founded by Sundiata Keita around 1235 C.E when he united the tribes of the Malinke people. Over a course of time, Mali empire became stronger and took over surrounding kingdoms including the Ghana Empire. Thus the empire flourished much with the contribution of Timbuktu (contributed with its trade).

the increased occurrence of polygamy

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;