Early in the 21st century most humans urbanized, and as a result became far less fecund. Populations worldwide contracted.
Advances in certain technologies - specifically those relating to construction - allowed people to move from city to city, or rural areas to urban ones, more easily, as a home now cost considerably less than a vehicle did in the 20th century. This allowed not just nuclear families, but entire social groups, to easily move from city to city even if only a small percentage had gainful employment.
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