Today at US Immigration I was told that I have spent too much time in the USA and they want some explanations. I countered that I have never overstayed the allowed amount of time in the USA (max 3 months at a time for my passport, and max 6 months a year total). They replied that any time spent in North America (Canada and Mexico) counts as time spent in the USA. This is news to me. Was this just a rogue agent or am I going to have hassles every time I enter the country? In the end, they let me through and warned me to not spend so much time in the United States of All of North America.