It's not land locked it sits on one of the largest fresh water sources on earth. The Great Lakes combined are like the size of certain seas.
Its centrally located for rail, trade, industry and the sort. Also, you cannot negate the Great Migration which flooded Chicago, Detroit, Cleveland, Pittsburgh and the sort with MILLIONS of people (and not just black people).
Likewise we can not negate that Chicago is in the middle of an incredible trend that has White people shook:
"...One thing is certain: Illinois’ population has declined by 157,000 residents over the past five years, making it one of only two states — West Virginia is the other — to lose people over the past decade. ...Illinois’ predicament is a perfect storm of ...long-standing economic discrimination against black residents, high housing costs, and the continued draw of residents to the Sun Belt... A 2016 poll by Southern Illinois University found that nearly half of Illinois residents wanted to move to another state... Between 2017 and 2018, 114,000 more residents left Illinois than moved in from other states. Those who left mostly moved to Florida, Texas and Indiana, IRS data shows... ."
"Since peaking in 1980 at nearly 1.2 million people, the black population of Chicago has dropped by more than 400,000 people, and the trend continues. Black residents are leaving Chicago for the suburbs and for neighboring states such as Indiana, Iowa and Wisconsin.
Some are reversing the Great Migration of the first half of the 20th century, returning to Southern cities including Atlanta, Dallas and Houston, said Pete Saunders, an urban planning consultant based in the Chicago area who has written extensively on this issue.
“They just feel frozen out of opportunity,” he said. “They feel Chicago is a closed system. They can’t get ahead here. It’s designed for others to get ahead.”"
"...Chicago is among a handful of metropolises that are losing their black residents, including Los Angeles, San Diego and San Jose.
The high rate of black residents leaving is the main cause for Chicago’s stagnant population, and the drain could get worse, several fair housing advocates and urban demographers said.
More than a third of young adults want to leave Chicago, a January survey from the University of Chicago’s GenForward Project found. Participants, especially African Americans, said the biggest reason for wanting out was racism and how that affects policing, job opportunities and neighborhood development.
Chicago’s new African American mayor, Lori Lightfoot, seems keenly aware of this challenge, calling it “the proverbial canary in the mine shaft” when asked in April about the city’s population decline by the Chicago Tribune... ."
Why Are Residents Leaving Illinois in Droves?