Imagine the internet like a network of highways connecting cities. Just like how traffic can get jammed on highways during rush hour, internet data can experience delays when too many data packets try to travel through the same "internet highways" at once.
In the Midwest and surrounding regions of the United States, a lot of internet traffic is routed through Chicago. This city acts as a major hub for data, similar to a big train station where many routes converge. When most internet data have to pass through Chicago, it can lead to what is known as the "Chicago Problem."