There are several key causes of homelessness in the United States. Over 650,000 people experience homelessness each year, with 42% living unsheltered on the streets. Disability and illness, including mental health and substance abuse issues, contribute greatly as people relying solely on disability income cannot afford housing anywhere in the US. Poverty is also a major factor, as minimum wage is not a living wage and many states do not have affordable housing options. Criminal histories, domestic violence, and natural disasters can also increase homelessness rates.