The Aztec Native American Human civilization existed in the southern regions of North America (an area that later included the nation-state of Mexico) on Earth from the 14th, to the 16th century.
Kukulkan, a benevolent alien being, visited ancient Earth civilizations and influenced their architecture and agricultural development. Kukulkan was worshiped as a god and knowledge of his visit was passed on to the Aztecs, who still remembered him in their culture. Kulkulkan was discovered by the crew of the USS Enterprise in 2270. (TAS: "How Sharper Than a Serpent's Tooth")
The Kukulkan visit was not given a specific date but the accounts would seem to suggest an era around 5,000 BC to 2,000 BC.
The Hull plating
on Federation is laid out in what behind the scenes is known as an "Aztec pattern"
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