@evan At present, if there's a full scale invasion, no such thing is possible. This is the most powerful military in all human history we are talking about.
To be clear, yes, a troublesome insurgency that adds to the domestic American polycrisis such that continuing is impossible is likely our only hope. But we should not be unrealistic. Vietnam went on for ages.
And moving millions of people hundreds of kilometres is simply not feasible and would pretty much immediately end our economy.