For fuggs sake - like the USA ACTUCALLY made up the wave. Sometimes your nation is pathetic.
The Wave originated in Mexico gaining prominence in the World Cup finals in 1970. It was then used internationally at sporting events (incl. College Football, Hockey and Pro-Football in the US). It was first seen (internationally) in Mexico City in the Azteca Stadium in 1968 during the Mexico Olympics. Mexico's right of ownership was confirmed during the Mexico World Cup two years later. It gained a 'craze' status in 184 when used in the Olyimpics Opening Ceremony in LA in 1984 which spawned the Mexican Wave craze of the 1986 world cup.
Other anecdotal, unconfirmed reports claim that the wave has long been a staple of the huge crowds at south american soccer matches for decades.
Much as I love you guys - America did NOT come up with the wave idea - though they did have a large part to play in drawing it into international conciousness.