When the Spanish under Cortes first encountered the indigenous people in Mexico, which feature of the Aztec Empire made the greatest impression upon them?

Cortes and the Spanish soldiers he brought with him were greatly impressed with the Aztec Capital: Tenochtitlan.

Explanation:

Tenochtitlan was the Aztec capital: a large city build in the middle of a lake: the lake of Texcoco.

Tenochtitlan was connected to the mainland by causeways and bridges, and had aqueducts made of terracota.

The Spanish marvelled at the city, and this motivated Cortes to meet the Aztec Emperor: Moctezuma.

zoom in on the bill of rights. the other side was just as divided: some antifederalists opposed the constitution only because it lacked a bill of rights, and others opposed it on other grounds and merely used the bill of rights as an excuse to campaign against it.

lincoln declared that slavery should not be allowed to spread into the new states, and of course this angered the south at the time.