This Bachelor thesis aims to uncover the main reasons the Swedish emigrants stated for migration during the mass migration to North America during 1840 to 1914. The research material used for this thesis is a mix of Swedish emigrant letters, letters to the Swedish government’s report on migration (Emigrationsutredningen) and letters to the editor of the Chicago based Swedish-American newspaper Svenska Amerikanaren. By using quantitative content analysis I got results that are presented in this paper through different categories of stated reasons. The distribution of the categories in the different kinds of material and how the distribution of stated reasons changed over time is presented through charts. Results show that the by far most stated main reason for migration during all the periods of the mass migration was to improve the economic situation of the Swedish emigrant. The results also show that the stated reasons for migration confirms a lot of the ideas and research presented by earlier studies on the subject of the Swedish migration to North America during 1840-1914.