Salvador Duran Sanchez raced in which series where drivers solely represented their nation as opposed to themselves or a team?
Salvador Durán:  Durán has also previously competed in A1 Grand Prix, Formula Renault 3.5, and the NASCAR Toyota Series. A1 Grand Prix:  It was unique in its field in that competitors solely represented their nation as opposed to themselves or a team, the usual format in most formula racing series.
A1 Grand Prix