>>512119246Come to think of it, it would also be significant because EU membership actually comes with a binding defense clause so US would have to border a non-insignificant military union for the first time since British empire days
Entire north of the country would be exposed to a hypothetical future EU federation and possible invasions from it, while arctic warming would make it easier for Europe to connect with Canada over the water
US would de facto lose its geographic isolation over night and be forced to re-evaluate its military strategy. Even if you argue US is stronger it doesn't matter, it's still a security threat that gives Europe a significant bargaining power, especially considering the relative proximity of important US cities to Canada