The Pan American Games consist of a variety of sports, take place every four years, and is contested by the members of the Pan American Nations. The first Games took place in 1951 at Buenos Aires (arg). The Games are organised by the Pan American Sport Organisation. The PASO consists of 42 national federations. The next Pan American Games will take place in 2007 at Rio de Janeiro (bra) and in 2011 at Guadalajara (mex).