In Tunisia, a small, homogeneous state on the southern Mediterranean, a popular uprising forced the overthrow of a long-ruling dictator in early 2011. Ruthless repression of mass protests failed. In just one month, Tunisians ousted an entrenched authoritarian regime.
In Iran, a mass uprising that lasted six months was brutally suppressed. The Green Movement of 2009 never became a "Green Revolution." Instead, an entrenched authoritarian regime reasserted its authority. The regime's violent repression succeeded. The opposition was broken, and the regime has since tightened its grip on power. Four factors help explain the success of mass protests in Tunisia and their failure in Iran.
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