Wanderlust World Wanderlust World Contrary to the premise, Mexico City did not experience a unique population surge specifically in the 1940s. Instead, its growth has been a continuous, centuries-long process driven by enduring structural factors.
The steepest acceleration occurred 1940-1980, not uniquely the 1940s.
Land concentration (haciendas), agricultural modernization, and rural poverty pushed millions toward the capital. The 1910 Revolution accelerated this by disrupting rural life and promising land reform that often favored urban industrialization.
Government policies (import substitution, 1930s-1970s) concentrated manufacturing in Mexico City: textiles, food processing, automotive, chemicals. Jobs followed factories.
As federal capital, Mexico City concentrated government employment, education (UNAM, IPN), healthcare, and cultural institutions—creating a powerful "primate city" effect.
High birth rates (until 1970s fertility decline) plus declining mortality fueled growth regardless of migration.
The 1940s saw continuation of existing trends, amplified by WWII demand for Mexican raw materials and labor (bracero program redirected some migration northward). No singular 1940s event caused a spike.
Today, growth has slowed. The metro area expands into neighboring states (México, Hidalgo, Puebla). Water scarcity, air pollution, inequality, and seismic risk challenge sustainability. Government policies now encourage decentralization and secondary city development.
Mexico City's magnitude reflects not a decade's anomaly, but the cumulative weight of history, geography, and policy on the Valley of Anáhuac.