New Delhi, June 20 -- As people gathered across the U.S. to celebrate Juneteenth on Friday, former President Barack Obama and former first lady Michelle Obama welcomed the first visitors to his presidential center.

Located on a sprawling campus on Chicago's South Side, the center honoring the nation's first Black president has been designed to inspire people to make the change they want to see in their own communities. It's the kind of contemplation that also comes as Americans gather for Juneteenth, which celebrates the end of slavery in the U.S.

The holiday marks June 19, 1865, when Union troops arrived in Galveston, Texas, at the end of the Civil War with an order declaring the state's enslaved people to be free with "absolute equali...