During the 17th century, the number of Native Americans dropped drastically due to diseases brought by the European settlers, such as measles and smallpox, and by the 1640s the Tiwa population was concentrated into four major pueblos: Isleta, Sandia, Puaray and Alameda.
"The 1930's marked a time when Albuquerque families began moving to the North Valley in greater numbers, some buying and restoring abandoned adobe homes, others proceeding to build large new houses."[REF]