The book comprises how the parallel processes that converged chronologically in the presidential announcements made at noon on December 17, 2014 by Presidents Raúl Castro Ruz and Barack Hussein Obama were conceived and developed, and has a strategic dimension for Cuba's foreign policy. The author of this text proposes, among its fundamental objectives, to explain what transformations occurred from within American society, from Cuban society and in the regional context, which, in their interrelation, served as a threshold to a different era in bilateral relations.