The greatest area for sanatoria was in Tucson with over 12 hotel-style facilities in the city. By 1920, Tucson had 7,000 people who had come for treatment of tuberculosis. So many people came to the West that not enough housing was available for them all. In 1910, tent cities began to pop up in different areas; one was described as a place of squalor and shunned by most citizens. Many of the infected slept in the open desert. The area adjacent to what was then central Phoenix, called Sunnyslope, was home to another large TB encampment, with the residents primarily living in tents pitched along the hillsides of the mountains that rise to the north of the city. Several sanatoria also opened in southern California in the early part of the 20th century due to the dry, warm climate.