Why did the Aztecs focus on having a strong military

War was an important part of many of the Aztec religious festivals. Warfare was the main driving force of both the Aztec economy and religion, which drove them to make sure they had a strong military.

Explanation:

Aztecs engaged in war for two main reasons. 1.) for conquest to reap tribute. 2.) to take captives for religious sacrifices necessary to satisfy the gods. Because of this, War was a big part of the Aztec society.

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.