The MLS All-Star game has been going on ever since the league was created back in 1996. Since then, there have been changes to the format of who will play who. It started off being the classic East vs West, but in 1998, the league decided to do a MLS USA vs MLS World, which was players in the league that were born in the U.S taking on players in the league born abroad.
They then went back to the East vs West showdown from 1999-2001, but MLS All-Stars vs Guest in 2002 and 2003. The “Guests” were the U.