so?
Because the Americans were being annoying and they felt they needed to enforce the laws.
Today Mexico's culture is a mix of Native Americans and Spanish cultures.
The arrival of the Europeans did not affect the native americans in Mexico.
American adopted the illegal immigration laws from Mexico. When a person or persons enter the country illegally, and are caught they are sent to a prison facility and transported back to their home country.
Southwesterners from Mexico are known as Mexican-Americans.
As Mexico has always been in North America they have always been "Americans" in a sense. As far as having "American" as their nationality, Mexico is nation and its citizens are Mexicans not Americans. If a Mexican person moves to the United States and becomes a citizen it is in that country's laws how long the person must be in residence before applying for citizenship.
The motorcycle laws in Mexico is everyone should wear HELMET.
What is Mexico law on extradition?
Over 750,000 US Citizens currently live in Mexico (taking advantage of dual citizenship laws) and over 1 million Americans have a residence in Mexico (from which at least 250,000 are known as snowbirds).
with drugs
Immigration from Central Americans into Mexico.