I am Irish currently on a holiday visa in Mexico looking to go to the United States for a few days. Two questions for you guys:
Do I need an ESTA if I cross by land and if not what is the process?
I know that if I travel by plane into the US, I have 90 days. I know that my ESTA doesn't reset if I travel to Canada or Mexico, but my question is if i fly into the US and leave by land back to Mexico and I want to come back to the US in 6 months, will it be seen as if I overstayed my first 90 days as my time is counted in Mexico? I know its a complicated question and I hope I phrased it correctly.