Political newcomer Lori Lightfoot has been elected Chicago mayor, becoming the first black female - and openly gay - leader of the city.
Chicago Mayor-elect Lori Lightfoot wants federal prosecutors to re-examine the so-called "code of silence" trial.
Lightfoot took home 73-percent of the vote, making this her first time elected to public office.
"We can and we will break this city's cycle of corruption", she said late Tuesday.
She and Ms Preckwinkle were the final two left competing in Tuesday's run-off election. In 2015, now-outgoing Mayor Rahm Emanuel appointed her to head the Chicago Police Board.
Mayoral candidate Lori Lightfoot clinches her fists as she speaks during her election night celebration after defeating her challenger Toni Preckwinkle in a runoff election in Chicago, Illinois, U.S., April 2, 2019.
Wednesday morning, she began her duties at an El stop greeting commuters, saying, "Now let's get to work bringing real change to every neighborhood across Chicago". They have a 10-year-old daughter and live on the northwest side of the city.
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"They're seeing a city where it doesn't matter what colour you are, where it sure doesn't matter how tall you are, and where it doesn't matter who you love", Lightfoot said.
But the significance of her win also transcended race or gender.
Seven other U.S. cities including Atlanta, New Orleans and San Francisco are now also led by black women. Rather, she wanted "to do something where I would be able to take care of myself financially", she said.
"She had more of a unity-type thing that kind of reminded me of Harold Washington, where she would let everybody in", Allison said.
Preckwinkle also tried to cast Lightfoot as an insider for working in police oversight posts under Emanuel and police oversight, procurement and emergency communications posts under Mayor Richard M Daley. In Lori's LGBTQ policy framework, she outlines increasing LGBTQ representation in government by appointing mayoral LGBTQ liaisons, bolstering safety and justice for the trans community by improving police training and thoroughly investigating hate crimes, and addressing the needs of Chicago's LGBTQ community by creating youth drop-in centers and expanding housing options for seniors and veterans.
The runoff between two African-American women was a rarity in the United States, where only 6 percent of mayors in the 200 USA largest cities are women of color, according to the Reflective Democracy Campaign.
She has expressed support for a casino in Chicago and changing the state's income tax system to a graduated tax, in which higher earners are taxed at a higher rate-two measures lawmakers have unsuccessfully tried to pass for years.