All over the world, there are different cultures of people. They may be similar in the language they speak and their traditions, but culturally they identify differently. An example of that is with Mexicans and Spanish. These two cultures share that people from both language speak the Spanish language, but they have many differences between them. One of those differences between them is where they derive from.
Those who identify as Mexican come from Mexico, while those who identify as Spanish come from Span. Another difference between them is in their features. Spanish people resemble those from Europe, while Mexicans have darker skinned features.