"Big industry has brought all the people of the Earth into contact with each other, has merged all local markets into one world market, has spread civilization and progress everywhere and has thus ensured that whatever happens in civilized countries will have repercussions in all other countries. It follows that if the workers in England or France now liberate themselves, this must set off revolution in all other countries – revolutions which, sooner or later, must accomplish the liberation of their respective working class."