In April 1979, Juan Carlos was ready to cede Melilla to Morocco and entrust Ceuta to the international tutelage. This decision was initiated by the American embassy resulting in a meeting between King Hassan II and an envoy sent by Jimmy Carter.
A declassified document released by the CIA has shed light on the circumstances surrounding the Green March. Moroccans were able to enter the Sahara due to an agreement reached by Juan Carlos, Spain's Crown Prince at that time and King Hassan II, states the American agnecy.