Apply for a work Visa to the United States. With the Visa you will be able to work in the United States regardless of the country you are from because that would be trivial.
No, they are Mexican citizens.
Yes, Mexican citizens can travel to the US with the appropriate visa or travel authorization, such as a tourist visa or a valid passport with a visa waiver.
Yes, US citizens can work in Germany with the appropriate visa and work permit.
All US citizens have representation in the US government.
No, US citizens cannot work in the UK without a visa.
From 1929-1939 Mexicans and Mexican Americans [citizens of the U.S.] were deported. According to the book, Decade of Betrayal, about 2 million Mexican and Mexican-Americans were deported. This represented 1/3 of the Mexican population in the US during the period of 1929-1939. Of the 2 million deported, it has been estimated that 60-75% were US citizens and US legal residents.
A company has to sponsor the Mexican to get a work visa.
Mexican is not a language. In Spanish, Estados Unidos Americanos, abbreviated EE. UU. - US citizens are Estadounidenses.
Indeed.
Yes.
Yes, US citizens can work in the UK, but they may need to obtain a visa or work permit depending on the type of work and length of stay.
If Mexican nationals apply for US citizenship they might get legal papers, IF they are accepted as US citizens.