What rol did the native Americans play in founding of Mexico city?

A lot. Mexico City was built on top of the ruins of Tenochtitlan, the capital city of the Aztec Empire, which was destroyed by the Spanish in 1521. Indigenous people were involved in the construction of Mexico City, providing a labor force for building the city's infrastructure and architecture, such as the Metropolitan Cathedral and the National Palace. Some Indigenous peoples also intermarried with Spanish settlers and contributed to the city's cultural heritage.