A Late Delivery from Morytha

In the game Xenoblade Chronicles 2, there is a late-game genre shift reveal, by now almost a cliche in and of itself, where the fantasy world of Alrest is revealed to be an after-the-end scifi setting floating above the clouds of future Earth. Central to this reveal is the dead city of Morytha on the surface of the planet beneath the clouds. Morytha is actually Chicago. We know this for three reasons. First, there are Interstate 90 road signs and skyscrapers everywhere, which immediately narrows the possible locations to one of a very small set of large cities stretching from Seattle to Boston. Second, the sheer volume of fresh water needed to grow a tree with the diameter of a small town that reaches halfway to orbit means it must be on one of the Great Lakes. Third, the streets of Morytha are full of black people that try to murder you on sight.