Contemplate a world where the US no longer pays for the defense of Europe against the menacing Red Bear. We withdraw our troops, stop paying for the upkeep of our nuclear weapons there, disband our bases, etc.
What happens when Europe has to start paying for their own military defense? One thing for sure, the green energy and finger pointing about how polluting the US is goes bye bye.
Other than the UK, Europe is largely under US protection from Putin et al/etc or whatever Iranian Ayatollah&President whacko currently wants to wipe somewhere off the map.