I am planning on transiting to Los Angeles on an ESTA (I will be in the USA for maybe 2-3 weeks) from there I want to cycle into Mexico and the rest of Central America. 5-6 months later I would like to cross back into USA from Mexico at a land crossing and cycle north to Canada. Will I be able to get 90 days at the border going into USA or will my time in Mexico reduce the days?
I have an Australian passport.