This expert has tracked 30 years of global protests. Here’s what he’s learned.

A research project in New York has tracked growing attempts to remove politicians from power—from Lebanon to Thailand.

As rioters began storming the U.S. Capitol last Wednesday, David Clark, a professor of political science at Binghamton University in western New York, was in a nowadays rare in-person meeting with a few other faculty members. The group at the table included an anthropologist, an art historian, and a psychologist. As their phones began to buzz with the stunning news, the group looked to Clark for his analysis.

For the past seven years, Clark has run the Mass Mobilization Data Project, an effort to track global protests since 1990. What he doesn’t track are protests on American soil. He had expected this year’s contentious election to stir up violence in Washington, D.C. But he had never imagined that

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