Paul Mattick said of Rosa Luxemburg and her internationalism:
'While Rosa Luxemburg did not fare well with her theory of accumulation, she was more successful in her consistent Internationalism, which was, of course, connected with her concept of accumulation as the global extension of the capitalist mode of production. In her view, imperialist competition was rapidly transforming the world into a capitalist world and thereby developing the unhampered confrontation of labor and capital. Whereas the rise of the bourgeoisie coincided with the formation of the modern nation-state, creating the ideology of nationalism, the maturity and decline of capitalism implied the imperialistic 'internationalism' of the bourgeoisie and therewith also the internationalism of the working classes, if they were to make their class struggles effective. The reformist integration of proletarian aspirations into the capitalist system led to social-imperialism, as the other side of the nationalistic coin. Objectively, there was nothing behind the frantically growing nationalism but the imperialist imperative. To oppose imperialism demanded, then a total rejection of all forms of nationalism, even that of the victims of imperialist aggression. Nationalism and imperialism were inseparable and had to fought with equal fervour.'