If you fly from the US to Mexico the US will know about your departure, if you go by land (bus) they will not (there are no exits checks) so you should expect some questions about when you left the US upon your return, showing them your Mexican entry stamp should be sufficient.
11

bzookaj
It should be noted that "lawful right of entry," "right to reside," and "legal resident" are not necessarily equivalent (though there is overlap), and the VWP only considers the last.
12
Thorn Tree
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