What was the main purpose for the formation of the Triple Alliance in 1428 C.E.?

To build the great city of Tenochtitlán

To create a shared system of trade routes

To overthrow the ruling Tepanec kingdom

To establish a common religious belief system

Which event is considered the beginning of the Aztec Empire?

The founding of the city of Tenochtitlán

The defeat of the Tepanecs by the Triple Alliance

The arrival of the Aztecs in the Valley of Mexico

The construction of the first chinampas