It would seem to me that Texas immigration rules is not only illegal, but fails to meet the needs of and violates the convention of Guadalupe. The concept, position of Mexican nationals in the American west on what is now US ground, immigration, and movement of peoples between the US and Mexico, is basically defined in part by treaty law, which actually is above yet national law and becomes the “law of the land” per article 2, section 2.
This simple fact definitely makes it clear why border problems including emigration can only be a matter of national laws rather than says. In fact, significantly also, the Jay agreement defines these things for the American- US border. The Jay agreement particularly defines the free movement of indigenous peoples over the American- US border, also. No condition in the north you get that right away, and no position in the south can offend the treaty of Guadeloupe either.
In reality there are many conventional and ratified nation- to- state treaties the US national authorities is a party to that relate to human rights, immigration law, migrants, borders, and refugee practices. These agreements can only be anchored by and guaranteed through acts of federal laws. There is no role for state law, mainly that, like in Texas, it may contravene existing nation- to- nation treaty rights of various populations.
Nor can the present supreme court where many justices claim adherence to originalism be institutionally ignorant of the power of treaties and their historic relationship to borders, immigration rights, etc. After all, the Jay treaty itself was negotiated by, and named after John Jay, the “original originalist”, if you will, who served as the first chief justice of the Supreme Court. This makes the actions of the US supreme court not only a question of US law, not only a constitutional question of federal authority vs state law, but also
a question of international concern, especially with respect to long settled ,  ,  , nation- to- nation treaties which are the foundation of international relations. Only wilful ignorance offered as a form of deliberate incompetence can account for the US Supreme Courts action in regard to immigration law, and this can
form a basis for impeaching current justices.
David Sugar has authored free software for telephony as well as having collaborated with Russell Means on treaty issues and nation to nation relations, and has participated in tribal governments.
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