Mass migration in the past five decades fills classrooms with a mix of cultures, values and national identities. Swedish teachers find themselves working in multicultural classrooms. The aim of this study is to identify the challenges teachers face and propose solutions. This study uses the qualitative research methods of grounded theory and participatory action research. This exploratory research uncovered the theory that political factors, support, self-image and multicultural competence impacted the teachers’ central task of raising Swedish citizens. Additionally, teachers reveal their tactics and proposed solutions to manage the challenges in multicultural classrooms. Teachers call for policy changes, including smaller class sizes and providing multicultural competency skills for teachers.