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Fast-growing global trend: pop-up protests

Photo: Yasin Ozturk/Anadolu Agency/Getty Images

This weekend's massive flash rallies to protest President Trump's immigration policies — following the global women's marches and the March For Our Lives after the Parkland school shooting — represent a unified, accelerated activism surpassing even what was seen in the late '60s, social movement historians tell me.

Why it matters: The speed and scale of yesterday's pop-up protests is fascinating.