Spoiler: Aztecs
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Aha; it did not occur to us that you might be ignorant of these events. We speak of the invasion beginning here; since it seems any records the old Aztec rulers kept were lost in the revolution, we will provide an excerpt from our own:



You can see why we're not eager to have a potential Aztec stronghold on our doorstep, new regime or not. Tlacopan is fine. Any closer would make our generals uneasy. A port would be a direct threat.

That said, you and your government bear no responsibility for that war, so we'd be happy to point you towards potential city locations a bit farther from our lands. Your maps are probably better than ours in most areas, but we've explored most of the north - it's not terribly fertile land, for the most part, but there is open space and we're not planning to expand any time soon.