IMO, Chicagoans like to lean on their prior history of being a technological and manufacturing center.

You had some serious engineering here: Western Electric, Teletype, Bell Labs/Lucent, Stewart-Warner, Illinois Tool Works, USRobotics, Admiral Radio, Shure, Abbott Labs, Baxter, Rockola, Seeburg, Williams Electronics, Bally, Zenith, and of course Motorola. Motorola alone seeded lots of other small companies in the area.