Worldwide, Mexico ranks 11th with a population of about 120 million people. The population consists mainly of people of Native American descent and mestizo, the proportion of whites or black Mexicans is rather small compared to the indigenous people.
Mexican people are very polite, in fact respect and courtesy are very important their coulture. Mexicans always have a smile for other people, and they are willing to help out if necessary. At least, if you treat them with the same respect and politeness. (If you are not sure how to get his right, maybe you want to read our Tips for good manners for tourists in Mexico).