Kathleen Foody | Associated Press

Police say a gunman on a rooftop opened fire on an Independence Day parade in suburban Chicago, killing at least six people, wounding at least 30 and sending hundreds of marchers, parents with strollers and children on bicycles fleeing in terror. Authorities said 21-year-old Robert E. Crimo III was named as a person of interest in the shooting and was taken into police custody Monday evening after an hourslong manhunt.

Monday’s federal holiday dedicated to Christopher Columbus is highlighting the ongoing divide between those who view the explorer as a representative of Italian Americans’ history and those horrified by an annual tribute that ignores the native people whose lives and culture were forever changed by colonialism.