Mexican passports can only be acquired legally by people who are Mexican citizens. If the person who left the US to go to Mexico was already a Mexican citizen, he need only go to the Secretaria de Relaciones Exteriores website (in the Related Links below) to have the necessary meeting to acquire his passport.
If the person who left the US to go to Mexico was not a Mexican citizen, he would have to naturalize as a Mexican prior to receiving his passport (which would then proceed to the SRE meeting mentioned above. Naturalization usually takes a bit of time. To read more about the Naturalization process, please read the Wikipedia article in the Related Links.
US passports are for US citizens. Citizens of Mexico have Mexican passports.
Of course they can. It takes about 5 years to go through the naturalization process and it isn't free, but they can become an American citizen.
Yes. Between 740,000 and 1 million Americans have established Mexico as their permanent residence (2010).
Any Mexican can obtain a Mexican passport. Entry into the United States requires a visa. That is difficult to obtain.
Of course they can. It takes about 5 years to go through the naturalization process and it isn’t free, but they can become an American citizen.
Mexico
Americans didn't really begin to immigrate to Texas until after Mexico gained independence from Spain in 1821. Mexico established the conditions.
The principal reason was that Mexico feared (correctly) that Americans would become an overwhelming majority in Texas, thereby imposing their culture (and their practice of slavery, which was illegal in Mexico).
People immigrate to Mexico from all over the world. Most people who immigrate to Mexico come from the US. Reasons for coming to Mexico often include lower health care costs, warmer climate, and generally a more relaxed lifestyle.
they all thought the land was better to farm
Mexico
Because they are not able to migrate legally.
The first person to immigrate to America was an Asian ancestor of many Native Americans, and his or her name has been lost in antiquity.
A plentiful supply of inexpensive tequila.
Immigration from Mexico increased because the Chinese were not allowed to immigrate.
The arrival of the Europeans did not affect the native americans in Mexico.
Well, in 2004, 6,470 Americans immigrated to Canada