 The USRRC ran from 1963 until 1968 when it was abandoned in favor of the more successful Can-Am series, which was also run by the SCCA.In 1998 the USRRC name was revived by the SCCA as an alternative to the IMSA GT Championship, and revived the Can-Am name for its top class.For 1999 the series reached an agreement with the International Sports Racing Series in Europe, in which the two series would share the same rules for prototypes.