Aztec agriculture in the heart of the empire used chinampas for their crops. Chinampa is a method of farming that used small, rectangular areas to grow crops on the shallow lake beds in the Mexican valley. ... These islands then provided rich soil for crops with easy access to water.
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World War II led to a major advancement in domestic education because the GI bill was introduced, which allowed returning veterans to go to college for free. This greatly increased the education labor force and subsequently GDP. In terms of International Relations, the US left WWII the undisputed leader of the world.
