ah yep your right, there are 2.
Cosic I think in 1996
Petrovic in 2002
There are a few other non-american basketball players in there, but they weren't NBA players (hall of fame can include international players of renoun)
http://www.hoophall.com/halloffamers/year.htm
this is the link to which players were inducted in which years.
So I stand corrected, didn't know about Petrovic. So there are 2 non-american NBA players in the hall of fame now <grin>