They chose to create the declaration of independence because the English were being oppressive toward the new colonies. Since they didn't like it the created the document to break free of the English to be able to fight them. Even though there was already bloodshed they wanted to end that.
It was located near the present day city of Mexico City. It formed a confederacy with Texcoco and Tlacopán and was the Aztec capital by the late 15th century. Originally located on two small islands in Lake Texcoco, it gradually spread through the construction of artificial islands to cover more than 5 square miles. Hope this helped :))
All 10 of them I believe <span />
