The Third Wave: Democratization in the Late Twentieth Century

Huntington argues that the democratic transitions between 1974 and 1990—beginning with Portugal's Carnation Revolution—constitute the third major wave of democratization in modern history, following earlier waves in the nineteenth and mid-twentieth centuries. Unlike a general theory of democratization, the book offers an explanation of why and how this specific wave occurred, analyzing causal factors including authoritarian legitimacy crises, economic development, the transformed role of the Catholic Church, international pressures, and a 'snowballing' effect where transitions in one country stimulated others. Huntington emphasizes that waves are reversible: each previous wave was followed by a reverse wave back toward authoritarianism .

Huntington's distinctive contribution was not the idea that democratization comes in waves—that concept existed—but the systematic periodization of post-1974 transitions as a coherent third wave and the identification of specific mechanisms. He distinguished three patterns of regime change: cyclical (repeated alternation), second-try (a failed democracy replaced by authoritarianism, then replaced by lasting democracy), and interrupted (temporary suspension before resumption) . He also enumerated five elite groups whose choices shaped outcomes and offered 'guidelines for democratizers,' practical advice for those seeking to overturn authoritarian regimes .

Francis Fukuyama's 1992 argument held that liberal democracy had triumphed as the final form of human government, with no ideological alternatives remaining. Huntington explicitly rejected this teleological optimism. While Fukuyama saw irreversible victory, Huntington insisted that democratization waves are cyclical and subject to reversal . He warned that factors responsible for reverse waves in the past—weak democratic values among elites and publics, severe economic setbacks, social and political polarization—could cause the third wave to slow or halt completely . Fukuyama later acknowledged Huntington's framework as a more sober alternative to his own.

Huntington dates the third wave's start to April 25, 1974, when Portugal's military coup—initiated by the radio broadcast of 'Grândola Vila Morena'—overthrew the Estado Novo dictatorship . This preceded the Eastern European revolutions by fifteen years. By beginning with southern Europe and Latin America, Huntington captured transitions that occurred before the end of the Cold War and before the Soviet collapse could be cited as the cause. The Berlin Wall's fall in 1989 was part of the wave's crest, not its beginning, illustrating that the third wave had multiple origins rather than a single trigger.

Huntington identified a diffusion mechanism in which democratic transitions in one country stimulated transitions in others through demonstration effects, contagion, and international pressure. The successful establishment of democracy in Portugal, for instance, encouraged similar movements in Spain, Greece, and Latin America . However, Huntington was careful to note that snowballs can melt in unfavorable environments. He observed that the Middle East remained largely resistant to the third wave, and he acknowledged that Islamic concepts of politics might conflict with democratic premises . The snowballing metaphor captures both the momentum and the contingency of democratic diffusion.

Huntington's most striking empirical finding was that twenty-three of the twenty-nine countries that democratized during the third wave had prior experience with democracy . This 'second-try' pattern was more common than first-time democratization. Conversely, most countries with authoritarian systems in 1974 that had no previous democratic experience did not democratize by 1990. This suggests that what the third wave represents is not a universal democratic revolution but the consolidation of democracy in regions where it was already familiar, a conclusion that tempers the triumphalism of the era .