Theories of radical nationalism and socialism became popular in the 19th century, when the Industrial Revolution had first started to really change things in Europe and in other Western countries. The quick changes in society during the 19th century created enormous social tensions and dissatisfaction among many. Workers, realizing that the wealthy had the most to gain from free market capitalism, turned to other ways of modernization including communism and socialism. Those who believed that they could achieve what they wanted by gradual reform of the existing political structure were socialists while those who believed that the old order needed to be completely replaced by force were communists. Others rejected the socialist emphasis on international class politics and proposed nationalism as another alternative to individualistic capitalism. Unlike socialists or communists, nationalists believed that there was nothing inherently wrong with capitalism. They just thought it should be regulated and made to benefit the nation as a whole in addition to the few individuals who owned the means of production. In either case, political philosophies that emphasized nation and class were responses to a changing world that had uprooted old social beliefs. Communism, which is also described as "Revolutionary Proletarian Socialism" or "Marxism," is both a political and economic philosophy. The Communist Manifesto is widely regarded as the founding documents of modern communism. It provides an analysis of the limitations of capitalism and class struggle, and it presents the main principles of communist ideology in detail. Marx and Engels viewed the capitalist development which had taken hold in England, Belgium and to a certain extent France as revolutionary. It could destroy the old feudal societies which still dominated much of Europe and it could lead to