Iranian Americans or Persian Americans are U.S. citizens who are of Iranian ancestry or who hold Iranian citizenship. Iranian Americans are among the most highly educated people in the United States. They have historically excelled in business, academia, science, the arts, and entertainment. Most Iranian Americans arrived in the United States after 1979, as a result of the Iranian Revolution and the fall of Persian monarchy, with over 40% settling in California, specifically Los Angeles. Unable to return to Iran, they have created many distinct ethnic enclaves such as Tehrangeles. The Iranian American community has become successful, with many becoming doctors, engineers, lawyers, and tech entrepreneurs. Based on a 2012 announcement by the National Organization for Civil Registration, an organization of the Ministry of Interior of Iran, the United States has the highest number of Iranians outside the country.