The region where the Aztec civilization flourished is primarily located in what is now?

The Aztec civilization thrived primarily in what is now Mexico City, which was built upon the ruins of Tenochtitlán, the capital of the Aztec Empire. This area was situated in the Valley of Mexico and became a central hub for the Aztec people, known for their advanced agricultural, architectural, and social systems. The strategic location in the valley allowed for extensive trade networks and resource management, fostering the civilization's growth. The city itself, with its impressive temples, canals, and marketplaces, is a testament to the sophisticated culture that developed there.

The other locations mentioned do not represent the core geographic or cultural center of the Aztec civilization. For instance, Peru is known for the Inca civilization, and Machu Picchu is a significant archaeological site related to the Incas rather than the Aztecs. Oaxaca, while home to several important Mesoamerican cultures, is not identified as the heartland of the Aztec Empire, which was distinctly centered around modern-day Mexico City. Understanding the geographic and cultural distinctions between these civilizations is crucial in studying their histories.