Hundreds of thousands of Americans took to the streets in cities across the U.S. on March 24, 2018, in the biggest protest for gun control in a generation, spurred largely by the shooting that took place on Valentine's Day at Marjory Stoneman Douglas High School in Parkland, Fla., where 17 people died.

Students from Centreville, Va., wear targets on their chests as they arrive for the March for Our Lives rally on March 24, 2018, in Washington, D.C.
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