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Iowa has no big metropolitan cities. The largest is Des Moines and it's only a little larger than 200,000 people.

Not sure your data source on this, but according to the latest census the Des Moines metro is more than three times that number and the most rapid growing metro in the US. https://www.desmoinesregister.com/story/news/2017/03/23/des-...

A 600,000 metro area population is not a big metropolitan city.

You're just nitpicking now.

Des Moines + its suburbs has a population of 400,000 to 600,000 depending on just where you stop counting suburbs . It's a really nice town.