This essay has examined the social-democratic parties in both Sweden and Denmark and their political development regarding immigration policy during the period 2014-2018. This period saw a large number of refugees who came to Europe, which led to stricter immigration policy across Europe. The Danish migration policy has been stricter than the Swedish migration policy. Denmark is therefore interesting to compare with Sweden because they are a country similar to Sweden in many ways. The questions in this essay is following: - How has the Social Democrats migration policy evolved in Sweden compared to Denmark from 2014 to 2018? - How can these parties' migration policy be explained? The questions are answered by comparing the Social Democrats in Sweden and the Social Democrats in Denmark, which has been done according to the model Most Similar System Design (MSSD) with the control variables historical background, ideological, financial situation and political system. The explanatory variable is political culture and the dependent variable is a migration policy. The empirical material has then been compared in accordance with MSSD and opposed the theory othering. The conclusions of this essay are based on the fact that migration policy is different due to political culture.