Which environmental constraint primarily limited the expansion of chinampa agriculture in the Valley of Mexico during pre-Columbian times?

💡 Explanation

When evaporation exceeded rainfall, salt accumulated in the chinampa soils due to capillary action, poisoning the crops because the irrigation water was slightly saline. Therefore, salinization restricted expansion, rather than flooding, depletion or limited freshwater which were addressed by engineering feats of water level management.

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