1. Chicago elects first black woman mayor

2. 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. REUTERS/Joshua Lott

3. Supporters celebrate mayoral candidate Lori Lightfoot's early election results at her election night celebration. REUTERS/Joshua Lott

4. Mayoral candidate Lori Lightfoot speaks during her election night celebration in Chicago. REUTERS/Joshua Lott

5. Supporters celebrate mayoral candidate Lori Lightfoot's early election results at her election night celebration in Chicago. REUTERS/Joshua Lott

6. Mayoral candidate Lori Lightfoot speaks during her election night celebration in Chicago. REUTERS/Joshua Lott

7. Mayoral candidate Lori Lightfoot kisses her wife Amy Eshleman during her election night celebration. REUTERS/Joshua Lott

8. Supporters celebrate mayoral candidate Lori Lightfoot's early election results in Chicago. REUTERS/Joshua Lott

9. Chicago mayoral candidate Toni Preckwinkle takes a selfie with Abraham Lacy and his son Isaac Lacy at a polling place during a runoff election for mayor against Lori Lightfoot in Chicago, April 2. REUTERS/Joshua Lott

10. Chicago mayoral candidate Lori Lightfoot speaks with a supporter at the Logan Square Blue Line station, April 2. REUTERS/Joshua Lott

11. A voter fills out a ballot at a polling place during a runoff election. REUTERS/Joshua Lott

12. Chicago mayoral candidate Lori Lightfoot speaks to a reporter as she greets commuters at the Logan Square Blue Line station. REUTERS/Joshua Lott

13. Voters fill out their ballot at a polling place. REUTERS/Joshua Lott

14. Chicago mayoral candidate Lori Lightfoot greets a commuter at the Logan Square Blue Line station. REUTERS/Joshua Lott

15. Chicago mayoral candidate Toni Preckwinkle fills out paper work for her ballot. REUTERS/Joshua Lott

16. Chicago mayoral candidate Toni Preckwinkle leaves a polling place after voting. REUTERS/Joshua Lott

17. Voter Abraham Lacy casts his ballot with his son Isaac Lacy at a polling place. REUTERS/Joshua Lott

18. Chicago mayoral candidate Toni Preckwinkle waits to vote at a polling place. REUTERS/Joshua Lott

19. Chicago mayoral candidate Lori Lightfoot greets a commuter at the Logan Square Blue Line station. REUTERS/Joshua Lott

20. Voters fills out their ballot at a polling place. REUTERS/Joshua Lott

21. Chicago mayoral candidate Lori Lightfoot greets commuters at the Logan Square Blue Line station. REUTERS/Joshua Lott