Porcine reproductive and respiratory syndrome virus. For the Marvel Comics Superhero, see Blue Ear (comics). Porcine reproductive and respiratory syndrome virus (PRRSV) is a virus that causes a disease of pigs, called porcine reproductive and respiratory syndrome (PRRS), also known as blue-ear pig disease (in Chinese, zhÅ« lÃ¡nÄr bÃ¬ng è±¬èè³ç).
Spanish: Enslaved Africans in Mexico, 1537 (PDF) 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.
The first Native American group encountered by Columbus, the 250,000 Arawaks of Haiti, were enslaved. Only 500 survived by the year 1550, and the group was extinct before 1650. In the 15th century Spaniards and other Europeans brought horses to the Americas.uropeans also brought diseases against which the Native Americans had no immunity. Chicken pox and measles, though common and rarely fatal among Europeans, often proved fatal to Native Americans, and more dangerous diseases such as smallpox were especially deadly to Native American populations.