Mexico, empire of Mole it seems like now it would have been the Aztecs included as well. In the 18th century Mexico was a important place for all the other countries because Mexico had a big production of silver at the time. Mexico was a big part of the trade and a common stop of those trading. “Empire of mole” refers to Mexico’s culture and culinary background, I know this personally because mole is a sauce my family and I eat (Very delicious). Mole has been a very big cultural food for Mexicans for a long time. I think they were comparing and describing Mexico by its goods. In the book Frankenstein Mexico is brought up once in volume 1 chapter 3 “Cæsar would have spared his country; America would have been discovered more gradually; and the empires of Mexico and Peru had not been destroyed.” The discovery of these places shows the beginning to the start of trade and how it changed the people who gained from it. I think Marry Shelly included Mexico to include the excitement of this new country and how she was interested in it.

 https://blogs.bsu.edu/dlr/2017/04/05/consequences-of-selfishness-histori...)