The Communist Manifesto

Marx and Engels use the Communist Manifesto as a means of describing and explicating the position of communists of all countries. Communism, for Marx and Engels, is a world movement, not restricted to one country. Thus, they write about the processes of history that affect the entire world. At the base of their understanding of the world and its economic forces lies the notion of "class struggle". What does "class struggle" mean to you? How would you apply the concept of class struggle to contemporary society? Is class struggle a part of American politics today? Why or why not?