none
In terms of what? Economy? Military? Culture? You should be more specific.
The Indians or aboriginal people of Mexico (such as the Aztecs Mayans, and Chichimecas) were there long before the country existed. Therefore Mexican culture has always included some of the Indian ways of life and in no moment were they introduced to it. So in simpler terms, they did not "enhance" anything as they have always existed within the culture.
It depends on which terms you are talking about. Economy and living standards? No doubt the US is in much better shape. Culturally? Mexico has its own rich and very distinctive culture, even if American culture has been more "exported" throughout the world.
Northern Mexico qualifies as such, including border cities such as Tijuana, Mexicali, Chihuahua, Juarez, Monterrey or Matamoros having a distinct Tex-Mex culture and traditions. On general terms, Mexico as a whole is influenced by the United States -- not culturally, mind you -- due to the U.S. being the most powerful country in the world in both economic and military terms.
He conquered the Aztec empire, setting a foothold in the continental Americas and claiming most of present-day Mexico for the Spanish Empire. In terms of life changes, the original, pre-Columbian civilizations found throughout Mexico were wiped out, replaced by the culture, religion and language of the Spanish conquistadors.
No.
mexico city
In terms of what? For example, its status in terms of economic development is that of an "emerging market".
No. In terms of area, Mexico holds the 22nd place.
food
In geographical terms, both are equally close, as they share a common land border with the United States. In cultural, economic and diplomatic terms, Canada is much closer to the United States, as both share a common culture and language, and are close military allies.
In terms of area, Mexico city comprises 0.4% of the Mexican territory (Mexico City has an area of 7854 sq km/3032 sq mi). In terms of population, it has 18.6% of the total population (21.16 out of 113.7 million people)