Christopher Columbus
Since the late 20th century, historians have criticized Columbus for initiating colonization and for abuse of natives. Among reasons for this criticism is the poor treatment of the native Taíno people of Hispaniola, whose population declined rapidly after contact with the Spanish. Columbus required the natives to pay tribute in gold and cotton. Modern estimates for the pre-Columbian population of Hispaniola are around 250,000–300,000. According to the historian Gonzalo Fernandez de Oviedo y Valdes, by 1548, 56 years after Columbus landed, and 42 years after he died, fewer than 500 Taíno were living on the island. The indigenous population declined rapidly, due primarily to the first pandemic of European endemic diseases, which struck Hispaniola after 1519. The natives had no acquired immunity to these new diseases and suffered high fatalities. There is also documentation that they were overworked.
Montebello, California
Before the arrival of the Spaniards in the area known today as Montebello, the land along the Rio Hondo River was populated by the Tongva (Gabrielino) portion of the Uto-Aztecan family of Native Americans. The Tongva occupied much of the Los Angeles basin and the southern Channel Islands - Santa Catalina, San Nicolas, San Clemente and Santa Barbara; when Spanish explorer Juan Rodrigues Cabrillo arrived off the shores of Santa Catalina in 1542, he was met by the Tongva people. Because the language of the Tongva was different from the neighboring tribes it was called "Gabrielino" by the Spanish. As more non-natives arrived and settlements were established, illness and disease came with them. By 1870, the area had few remaining indigenous inhabitants as disease brought by the Europeans killed many of the Tongva.