Assuming that the left gets its shit together before Homo sapiens goes extinct.
My vote goes to either the USA or France. Especially because the Paris Commune already happened. “Smeagol did it once...he can do it again!” Paris seems to have been packed with rioters 24/7 for several years. Not so different maybe from the American Midwest. The ruling class is investing heavily in police in both countries. It’s afraid!
I know this seems partly delusional of me and that there is far more hope in the Global South unifying and then strangling the imperial core from the outside. But still, gun to your head, pick an imperial core country and explain how and why it will fall first. Marx, after all, predicted that socialism would come first to those places that had progressed along capitalist development the most. (Yes, you are invited to explain how wrong I am about this.) The USA falling to socialism would probably cause the rest of the planet to fall the same way.
edit: my choices seem embarrassing now, thank you for enlightening me comrades.
Italy isn't exactly the imperial core is it? It's one of the poorest European countries, although it probably still benefits from imperialism I assume.
You know how America came up with that stupid 1st 2nd and 3rd world labeling of the world, we need to make a map sorta like that but from a leftist perspective. Like there isn't an objective way to determine what country is an imperial core or not, I mean some are unquestionably are like the UK or the US and some are unquestionably not like Cuba and China. But what about South Africa or Mexico? Sure partially controlled but not fully incorporated.
italy directly had colonies. parts of it real rich too