Spoiler: Maya
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Greetings from the far south! Sadly, we know of only one source of stone building materials, and that's within the borders of the holy city of Tenochtitlan.

Have you considered just building one pyramid in each city and moving to a more efficient sacrifice model? During large ceremonies, we can get a throughput of one heart per thirty seconds thanks to some advanced surgical techniques we'd be happy to share with you.

(Did everyone get terrible pantheon choices for their start location? I bet everyone did.)

As for the visitors from across the sea, let us know if they get pushy. I'm sure the gods would appreciate some variety in their sacrifices.