Over the past decade, Turkey and Brazil have been widely celebrated as star economic performers—emerging markets with increasing influence on the international stage. Yet, over the past three months, both countries have been paralyzed by massive demonstrations expressing deep discontent with their governments' performance. What is going on here, and will more countries experience similar upheavals?

The theme that connects recent events in Turkey and Brazil to each other, as well as to the 2011 Arab Spring and continuing...