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Region Question

Hello everyone, I have the problem that I only have the main city in my region. In a couple of days, every newly built city is simply gone. what am I doing wrong? does something have to be built? or does something have to be researched?

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Ape Apps, LLC is an independent software development company founded in 2010 by Brandon Stecklein. Over the years, Ape Apps has published over 400 apps and games across various platforms. You can get in touch with Brandon on Twitter or by leaving a post on his wall @bastecklein
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