US energy independence is the idea of eliminating the need for the United States to import petroleum and other foreign sources of energy, either entirely or with the exception of imports from Canada and Mexico, in which case it is called North American energy independence. Energy independence is espoused by those who want to leave the US unaffected by global energy supply disruptions, and to restrict reliance upon politically unstable states for its energy security. Energy independence is highly concerned with oil, the source of the country's principal transport fuels.