Explain what tenochtitlan was

Tenochtitlan, also known as Mexico-Tenochtitlan, was a large Mexica altepetl in what is now the historic center of Mexico City. The exact date of the founding of the city is unclear. The date 13 March 1325 was chosen in 1925 to celebrate the 600th anniversary of the city.

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answer; i believe the correct answer is (the willamete valley);