The objective of the thesis is to explore if the European Union membership has changed the Swedish Green Party’s use of parlance, ideology and political content. To explore this, a quantitative content analysis has been done on election manifestos during a 30-year period on national parliamentary manifestos as well as European Parliament manifestos. A framework of green ideology as well as previous research of the Swedish Green’s is used to further the findings from the manifestos. The thesis has found that the European Union membership has affected the Swedish Greens which is seen in the change of how they use language, their transformation of ideas throughout the years as well as their views on political areas and how that has expanded. Further research is recommended to additionally explore the subject, a suggestion is to increase the material because that was an issue in this essay.