The North American Union (NAU) is an economic and political union of six member states, located in North America. The NAU was established by the Treaty of (INSERT) on March 10, 2010. With over 430 million citizens, the NAU combined generates an estimated 25.8% share (US$18 trillion in 2008) of the nominal gross world product and about 24.4% (US$17 trillion in 2008) of the PPP gross world product.