The pre-columbian civilizations of the aztec, inca, and maya were similar in that they all:
spoke the same language.
built large, complex cities.
used a complex written language.
had a monotheistic belief system.

The Pre-Columbian civilizations of the Aztec, Inca, and Maya were similar in that they all built large, complex cities.

Explanation:

-The Aztecs were members of a Mesoamerican civilization that created a high developed culture and existed between the 14th and early 16th centuries. In general, the term “Aztecs” refers to the ethnically heterogeneous, mostly Nahuatl-speaking population of the valley of Mexico; in the narrower sense, this means only the residents of Tenochtitlan and the two other members of the so-called "Aztec Triple Alliance", the cities of Texcoco and Tlacopan.

From the late 14th century, the Aztecs expanded their political and military influence over the surrounding towns and peoples over the years, which were not directly attached to the empire but were forced to pay tributes. At the height of their power, they controlled large parts of Central Mexico with the Valley of Mexico as their center. Between 1519 and 1521 the Aztecs were finally subjugated by the Spaniards under Hernan Cortes.

-The Mayan Civilization refers to a civilized and prosperous people living in southern Mexico, Guatemala, Belize and the northern part of Central America. Their culture was based on developed agriculture. Among the remains are pyramids and palaces. Their sculptures from the classical period (c. 200-1200) are regarded as one of the continent's finest art and their architecture, mathematics, calendar and astronomical system are believed to be highly innovative. Their writing followed a similar principle to Ancient Egyptian hieroglyphic writing.  

Between the Mayan cities, there was a network of trade links. The cities of Tikal and Calakmul were the most powerful and the city of Teotihuacan became the center of Mayan politics.

-The Inca civilization was a pre-Columbian civilization of the Andean group. It originated at the beginning of the 13th century in the Cuzco basin located in present-day Peru and then developed along the Pacific Ocean and the Andes, covering the western part of South America. At its peak, it extended from Colombia to Argentina and Chile, covering most of the present territories of Ecuador, Peru and almost the western half of Bolivia.

It was one of the great kingdoms of pre-Columbian America. This empire was led by the Sapa Inca. The Inca Empire was conquered by the Spanish conquistadors under the orders of Francisco Pizarro in 1532.

it took two men to wrestle rome back from chaos and turn a republic into an empire. in the first century bc, rome was a republic. power lay in the hands of the senate, elected by roman citizens. but the senators were fighting for power between themselves.