With a POD in 1900, make Second City's economic/financial power grow even further than its OTL heights and make them a true global city. Screwing NYC or London is not accepted.
Possible ideas:
Possible ideas:
- High-speed railway becomes developed over highways in the US, leading to Chicago's railway infrastructure being put to good use
- Natural gas and shale becomes predominant energy source in the US, with deposits in the Michigan basin processed/used in Chicago
- Major North American airlines use Chicago as the airline hub, along with airplane production becoming done mainly in Chicago