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That's not the same as against borders - see e.g. international trade, or tourism.

Socialism today seems to agree with borders ( https://www.youtube.com/watch?v=vf-k6qOfXz0 ), and back then, there was national socialism...

Einstein was explicitly anti stalinist and advocates globalism in his work "Why Socialism"

You can read it online

I don't understand how this is related to my comment and the comment I'm replying to, both of which you presumably just read online.

Link to the piece:

For there to be something meaningfully international, there have to be several nations, with something distinguishing between them.

Ok then call it global, it's not a meaningful distinction just a dumb nitpick