Suppose the US were to adopt a policy of "reciprocity" regarding how foreign nationals are treated in this country? Suppose we were to treat them using the same policy that their homeland used to treat Americans?
Article 33 - Foreigners are those who do not possess the qualities determined in Article 30. They have the right to the guarantees of Chapter I of the first title of this Constitution, but the Executive of the Union has the exclusive right to expel from the national territory, immediately and without necessity of judicial proceedings, all foreigners whose stay it judges inconvenient. Foreigners may not, in any manner, involve themselves in the political affairs of the country.