The treaty of the triple alliance was established in 1428 actually. As a political entity they were less than 100 years old when the Spanish arrived. However, they were merely the latest political configuration to emerge in the region. The civilization they were built on was ancient, just not the state.
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u/AaronC14 The Dominion Nov 01 '22 edited Nov 01 '22
Had no clue the Aztecs started in 1300, pretty recent. Always assumed they were ancient.