CEVAP:

Marx considered that the nation-state system is a part of the capitalist superstructure. National borders and identities are artificial divisions which served to reinforce the capitalist system, because they separate people who indeed share much in common. For Marx, people from the same social class in different nations have more in common than people who are from the same nation but different social classes. This is what Marx means with his well-known call “proletarians of all countries, unite!”. Believing that “workingmen have no country”, Marx thought as different countries become socialist, they will recognize that nations divide the proletariat. Thus, they will eliminate national borders and the whole world will become a single socialist society.