Karl Marx was a prolific writer and researcher who completed vast volumes of works and articles. With Engels and on his own he wrote about economics, politics, religions and societies with the overriding objective of promoting and eventually achieving Communism across the globe. Marx was convinced that his ideas would play a major role in spreading Communism everywhere beginning with the most technically and economically advanced nations and eventually the most backward of countries. He argued that history was on the side of the proletarians or industrial working classes. Revolution would come and with it Communism. Yet he was not always clear on how history made revolution inevitable.