Which condition initially prompted hydraulic agriculture in ancient Mexica?

💡 Explanation

Rising aridity spurred “chinampa” (floating garden) construction because increased rainfall variability caused failures in seasonal maize crops depending on steady rainfall, therefore intensive water management became necessary, rather than other issues initiating broad adoption.

• Which irrigation outcome occurred most favorably when Sumerian canals underwent regular dredging?
• Which risk increases when siege engines repeatedly strike ancient fortification walls at the same point?
• Which risk increased within the Aztec chinampas agricultural system due to intensive continuous maize cultivation?
• Which consequence results when poorly managed ventilation induces excessive depletion of silicon within a historical iron-smelting bloomery?
• Which consequence occurred when Roman siege engines targeted city walls using torsion springs beyond their design limits?
• Which risk was historically increased when manufacturing repeating crossbows using insufficiently tempered bronze?