Before they were conquered by the Spanish, the ___ people had established an advanced civilization that included large cities in central Mexico.

Aztec

Explanation:

The Aztec people can be found in the Aztec Empire which is located in central Mexico. The empire was successful until around 1519 when the Europeans came in, especially the Spanish.

This is evident in the fact that the Aztec capital city was known as Tenochtitlan which is located on an island in Lake Texcoco, central Mexico.

Hence, before they were conquered by the Spanish, the AZTEC people had established an advanced civilization that included large cities in central Mexico.

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).

the answer is b: an economic crisis throughout the country.