The Articles provided a weak central government, where the government did not have to power to tax. It also provided little means of revision. The Constitution, on the other hand, establishes the 3 branches, and more importantly, a constitutional government. The fundamentals of a constitutional gov’t include majority rule and minority rights, limited gov’t, institutional and procedural limitations on power including separation of powers, checks and balances, and due process of law.
And when the rulers died, the Aztecs buried them there and built a pyramid over them. The pyramids now stand like small mountains, though they were made by hand. And so they named it Teotihuacan, because it was the burial place for the rulers.