Less than five years ago, Sacramento was considered one of the fastest-growing cities in America. Now, because of one of the worst recessions in history, it has been reported that Sacramento has one of the highest rates of foreclosure in America. "People who have never been homeless are finding they have no place to live," she says. "Every shelter in Sacramento is filled to capacity."

Lisa visits a homeless shelter that has 236 women and children on its waiting list. Before America's economic collapse, it's estimated that 6,100 homeless children attended Sacramento schools. Joan, a advocate for the homeless, believes the number has increased since early 2008. "My fear is that we're going to see more than 7,000 children homeless in Sacramento schools," Joan says.

• Lisa Ling goes inside a tent city

From The Oprah Winfrey Show Tent Cities in America: A Lisa Ling Special Report