The EU couldn't sustain the level of proportional military spending that the USA does, maybe with the exception of Germany but they still spend around half as m

The EU couldn't sustain the level of proportional military spending that the USA does, maybe with the exception of Germany but they still spend around half as much as a share of gdp as the US does, so that would be an enormous shift. Fwiw, the existence of the EU basically presupposes the availability of the American army to provide security