Workers of the world, unite!
Proletarian internationalism is summed up in the slogan coined by Karl Marx and Friedrich Engels, "Workers of the world, unite!", the last line of "The Communist Manifesto", published in 1848. However, Marx and Engels' approach to the national question was also shaped by tactical considerations in their pursuit of a long-term revolutionary strategy. In 1848, the proletariat was a small minority in all but a handful of countries. Political and economic conditions needed to ripen in order to advance the possibility of proletarian revolution.