It's 2025. You can drive across most European countries in a day (a long day, in some cases, but still).
If Europe wants to stick to the borders a bunch of kings and princes hashed out in blood a hundred+ years ago it can, for the moment, but if we do, there's a decent chance it will just be crushed by the next global superpower (US, China, or weirdly enough maybe Russia considering how much influence they have over many US politicians now).
I love Europe. I was proud to become an EU citizen and my favourite scarf is an EU flag. I think it's an amazing place full of amazing countries and people. And it still can be! But for it to continue to exist, we MUST work together. Militarily, economically, and even practically (why is it so hard to book train tickets across 3 countries again?)
I know it stings, but the reality is the wolves are at the gates. Democracy has its back against the wall and we need a force that can fight back. Or government of the people, by the people, for the people, will soon perish from the Earth.