The evening news bulletin on Bulgarian National Radio began with a familiar item: Another meeting of the Politburo of the Communist Party’s Central Committee. Then the announcer uttered a sentence that left Bulgarians stunned: The country’s dictator of 35 years, Todor Zhivkov, had been “relieved of his duties.”

It was Nov. 10, 1989. I was only 15 but understood that what had happened was not just a simple personnel change in the government of the Soviet Union’s most trusted satellite. Within minutes — though a day late — I learned about the fall of the Berlin Wall. Those events changed my life more fundamentally than anything else I have experienced before or since.