Squatting in the United States is the unauthorized use of real estate. Historically, squatting occurred during the California Gold Rush and when colonial European settlers established land rights. There was squatting during the Great Depression in Hoovervilles and also during World War II. Shanty towns returned to the US after the Great Recession of 2007 to 2009 and in the 2010s, there have been increasing numbers of people squatting foreclosed homes using fraudulent documents. In some cases, a squatter may be able to obtain ownership of property through adverse possession.