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Why did the Aztecs build floating gardens and their capital city of Tenochtitlán?

User Sergeant
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The Aztecs wanted to be able to plant crops on rich soil found in lake beds
User Sayem Siam
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The main reason why the Aztecs built floating gardens and their capital city of Tenochtitlán on an island is because this provided for a great deal of irrigation, which was essential for healthy crop growth. 
User Max Fichtelmann
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