When did the 3 main city-states become form an alliance and Aztec Empire begin ?

In 1427, Tenochtitlan, Texcoco, Tlacopan, and Huexotzinco went to war against Azcapotzalco, emerging victorious in 1428.

if a bill passes in the house of representatives, it goes through a similar process in the senate. before a bill becomes law, it must be approved by both chambers of the legislature. the bill must pass with the same wording in the house of representatives and the senate before it can go to the governor for approval.

the correct answer is b