From Leon Trotsky’s History of the Russian Revolution
Language is the most important instrument of human communication, and consequently of industry. It becomes national together with the triumph of commodity exchange which integrates nations. Upon this foundation the national state is erected as the most convenient, profitable and normal arena for the play of capitalist relations. In Western Europe the epoch of the formation of bourgeois nations, if you leave out the struggle of the Netherlands for independence and the fate of the island country, England, began with the great French revolution, and was essentially completed approximately one hundred years later with the formation of the German Empire.