In 1977, the SCCA sanctioned the US events and in 1978 the CASC and SCCA series merged, and conducted the series jointly until 1983, when it ran as the "Formula Mondial North American Cup"; Michael Andretti won the championship.
V tistem času sta obe seriji privabljale tudi dirkače iz Evrope, na primer James Hunt, Jean-Pierre Jarier, Riccardo Patrese, Patrick Depailler, Jacques Laffite, Didier Pironi in Vittorio Brambilla.