O’Hare is so so large that it may be a good idea to print a terminal map so you can find your way to connecting flights.This is a *huge* airport so always allow enough time to get between flights. Generally airlines will allow enough time between flights so you don’t have to make a mad rush for the next gate unless the first plane arrives late. In fact if planes are on time you can (rarely) arrange for an earlier flight by showing up at the gate for an earlier flight to your destination. There are rules about scheduling close flights and they don’t always match up with the best plan for you personally.
For specific details about making “close” flights contact your airline.
Chicago O’Hare’s name is a *very* interesting story. Formerly”Orchard Field”, it was renamed after naval pilot Butch O’Hare, who led one of WW II’s most daring air battles to preserve the US Aircraft Carrier Lexington from an attack. A month later O’Hare led another daring attack against torpedo bombers. His plane disappeared. Butch O’Hare was never found.