Ms Lightfoot (new mayor of Chicago) joins a growing rank of record breakers being elected to high-profile mayoral office across U.S. country.
Twelve other US cities including Atlanta, New Orleans and San Francisco are now also led by black women today.
This list includes San Francisco's London Breed, the city's first female mayor since Democratic Senator Dianne Feinstein in 1988, as well as Rochester's Lovely Warren and Washington DC's Muriel Bowser.
Wow, celebrating diversity and down with old white male ideologies.
