Not a fifth lens, but the point the whole engine exists to make: historians describe the same country differently because they weigh its causes differently.
The cause of the 1959 Revolution is the sharpest dispute. The mainstream and economic readings treat it chiefly as the latest, most drastic attempt to break a long pattern of dependency — first on Spain, then the United States — that had left Cuban sovereignty and prosperity incomplete. The revisionist reading, by contrast, insists that any full account of 1959 must also reckon with an older, unfinished argument over race and equality reaching back to the independence wars and the 1912 massacre of Afro-Cuban veterans, an argument the geopolitical story tends to omit. Same revolution, different roots: a nation completing its sovereignty, or a society settling accounts left open since the nineteenth century.
Cuban identity itself divides the lenses in a related way. The cultural reading locates the deepest continuity in a centuries-long, still-unresolved negotiation over how African the nation is willing to recognize itself as being; the mainstream and economic readings locate continuity instead in the island’s relationship to whichever outside power currently buys its sugar or bankrolls its government. Both agree that Cuba has rarely, if ever, been fully self-directed; they disagree about which dependency — cultural or material — has mattered more.
On one point all four converge: Cuba’s modern history cannot be told as a purely internal story. Every lens, in its own vocabulary, describes an island whose fate has been repeatedly decided in relation to a larger outside force — Spain, the United States, the Soviet Union — even as they disagree about whether that force has been principally military and political, economic, cultural, or racial in character.
Reference status: every work cited is verified and correctly attributed — Louis A. Pérez Jr., Cuba: Between Reform and Revolution (Oxford University Press, 1988, rev. eds.) and Cuba and the United States: Ties of Singular Intimacy (University of Georgia Press, 1990, rev. eds.); Richard Gott, Cuba: A New History (Yale University Press, 2004); Hugh Thomas, Cuba: A History (1971, rev. 2010); Ada Ferrer, Insurgent Cuba: Race, Nation, and Revolution, 1868–1898 (University of North Carolina Press, 1999); Aline Helg, Our Rightful Share: The Afro-Cuban Struggle for Equality, 1886–1912 (University of North Carolina Press, 1995); Christine Ayorinde, Afro-Cuban Religiosity, Revolution, and National Identity (University Press of Florida, 2004); Fernando Ortiz, Cuban Counterpoint: Tobacco and Sugar (1940; Duke University Press ed. 1995); César J. Ayala, American Sugar Kingdom: The Plantation Economy of the Spanish Caribbean, 1898–1934 (University of North Carolina Press, 1999); Manuel Moreno Fraginals, The Sugarmill: The Socioeconomic Complex of Sugar in Cuba, 1760–1860 (Monthly Review Press, 1976). The revisionist row’s claims about how far the independence-war years actually unsettled Cuba’s racial hierarchy remain actively debated among specialists, as noted in that section.