Cities provide safe, clean and affordable housing for your colonists. It is much more difficult for alien flora and fauna to invade a City than open encampments, reducing colonial attrition as a result. Cities are manned by 1 Population unit, and provide housing for 100 additional Population. Note that construction of Cities is not a requirement for colonization, as your colonists will build their own housing. Cities do, however, reduce attrition for the colonists living in them.
1 per 100 population for maximum possible benefit
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Content contributed by Raven Zachary.