Answer:
Europeans' enslavement of Native Americans began with Columbus. As the governor of Hispaniola, he forced the Taino Indians to labor in the Spanish fields and mines, and he brought Taino slaves to Spain on his return journeys. About 50,000 Taino died within two years of Columbus's arrival, and by 1510 the Taino population had declined by nearly 90%, primarily from European diseases but also from brutal treatment. A new source of forced labor was required. In 1518 the Spanish king allowed the importation of slaves directly from Africa (previously they had been Spanish-born Africans), and the Atlantic slave trade to the western hemisphere began in earnest, finally ending over three centuries later with the abolition of slavery in Brazil in 1888.
Explanation:
The materials for the Ur ziggurat were bricks of mud and a material called bitumen. If the bricks were stacked with only mud between them, they would not have lasted long.
