The demand for increased slave labor in the sixteenth century was due to the dramatic expansion of the declaration of the Treaty of Tordesillas giving the Portuguese dominion over Africa. the Portuguese spice trade. colonization of the Americas spurring growth of the sugar industry. with the Ottoman empire's blocade of the Silk Road, dependence on cotton was shifted to the Americas. the elimination of the Portuguese from east Africa.

colonization of the Americas spurring growth of the sugar industry

Explanation:

The demand for slave labor grew with the growth of the sugar industry in America, mainly in South America. This is because sugar cane farms needed extremely cheap labor, so that profit was optimized. With the failure of the attempt to enslave slaves, Europeans saw blacks as a great option to force work on farms and in the production of sugar.

In other words, the demand for slave labor in the 16th century was due to the colonization of the Americas, stimulating the growth of the sugar industry.

the answer would b b

the enslaved people onboard suffered from illness with some frequency