V. I. Lenin

Thereis some similarity between the way mankind should arrive at the abolition
of classes and the way it should subsequently arrive at the fusion of
nations. Thus, only a transition stage of dictatorship by the oppressed class
leads to the abolition of classes, only the liberation of the oppressed nations
and real eradication of national oppression leads to the fusion of nations, and
the political criterion of the feasibility of this lies precisely in the
freedom to secede. Freedom to secede is the best and the only
political means against the idiotic system of petty states and
national isolation which, to mankind’s good fortune, is being inexorably destroyed
by the whole course of capitalist development.

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