The crucial question in the analysis of social unrest is why it occurs at a particular moment in history. Whether one refers to the new militant movements in the United States (“Black Power,” “Red Power,” “Ethnic Power”), Ukrainian nationalism in the Soviet Ukraine, Great Russian revitalization, or the recent World Slovak Congress held in New York; it is clear that traditional systems of social stratification in the United States and Soviet-dominated Eastern Europe are now being severely strained. As Shibutani and Kwan have emphasized, in stable stratified societies the inequality of prerogatives goes unquestioned, even by the subjugated who willingly support it. Only in periods of instability is the differential access to opportunity questioned. And dissatisfaction arises only when alternatives to the status quo are perceived. This insight is the core of the “theory of relative deprivation.”