Surely by definition, being pro-EU is automatically anti-nationalism (at least for everyone inside the EU)?
The extremists want you to believe that, but the EU is an economic alliance, not a federal republic. Being pro-EU is usually anti-isolationist, but it isn't always anti-nationalist.
The extremists want you to believe that, but the EU is an economic alliance, not a federal republic. Being pro-EU is usually anti-isolationist, but it isn't always anti-nationalist.