Most major cities in the NE and Midwest experienced population decline in the mid-late 20th century. The difference is, many of these cities have found ways to stem this decline, or the decline has been relatively minor in proportion to their size, especially in the case of Chicago and Philadelphia who have more or less stabilized after only losing 25% of their peak population.
Are you sure you mean urban planning, or socio-economic development? Chicago [[outside of New York and possibly San Francisco) has the best urban infrastructure in the country, and the strongest urban core outside of NYC.
I understand Chicago has its problems when it comes to the economy, corruption and racism like Detroit, but at the same time, unlike Detroit they have managed to put those things aside and still remain a successful city that many people are proud to call home, visit and be associated with.
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