I was wondering if it would be possible to arrange a longer stay (I have some travel plans that would take longer to complete: Appalachian trail, route 66, etc.) by first applying for B-2 visa to stay for 6 months, then briefly leaving US to e.g. Mexico or Canada and then applying for the Visa Waiver and returning for 90 more days?
So I was wondering if it's technically possible, and whether the authorities may question the situation and interview me? I'm an EU citizen. Thanks!