Chicago main city is rich because its green. See the Millenium Park, Planetarium and adjoining plantations. Through the Chicago river as seen from boat ride one thing which impressed me most was the effort and successful one to keep city green. A larger number of trees were newly planted on several streets and dividers. Chicago is rich because its green in vegetation and nature loving ? Even buisy roads have trees on them which are protected well. If you want to be rich grow some trees in your city also.