In this Dec. 11, 2007, file photo, members of the Maricopa County DUI chain gang are escorted to their assignment in Phoenix. As the nation on Thursday, June 17, 2021 officially made Juneteenth a federal holiday, honoring when the last enslaved Black people learned they were free, lawmakers are reviving calls to end a loophole in the Constitution that has allowed another form of slavery to thrive. (AP Photo/Matt York)