Revolutions of 1848 carried out, occurred in Greater Poland. Next, the middle classes began to agitate. Karl Marx and Friedrich Engels, working in Brussels, had written "Manifesto of the Communist Party" (published in German in London on February 21, 1848) at the request of the Communist League (an organization consisting principally of German workers). Following the March insurrection in Berlin, they began agitating in Germany. They issued their "Demands of the Communist Party in Germany" from Paris in March; the pamphlet urged unification of Germany, universal suffrage, abolition of feudal duties, and similar middle-class goals. The middle and working classes thus shared a
History of modernisation theory allows people to think in new and innovative ways; innovation is thus coeval with modernisation. Among the academics who contributed much to this theory are W. W. Rostow, who in his "The Stages of Economic Growth: A Non-Communist Manifesto" (1960) concentrates on the economic system side of the modernisation, trying to show factors needed for a country to reach the path to modernisation in his Rostovian take-off model. David Apter concentrated on the political system and history of democracy, researching the connection between democracy, good governance and efficiency and modernisation. Seymour Martin Lipset in "Some Social Requisites of Democracy" (1959)