What was the "Three Field System" and how did it revolutionize European agriculture?

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The three-field system let farmers plant more crops and therefore increase production. ... Crop assignments were rotated every year, so each field segment would be planted for two out of every three years. Previously a "two field system" had been in place, with half the land being left fallow.

Explanation:

food and resources were plentiful.

women were encouraged to marry later in life so they could work in factories.