Migration is a defining phenomenon of the 21st century. Even though it is historically not a new phenomenon, the current migratory movements are unprecedented. During the past decades millions of people, including families and their children, migrated often from lowand middle-income countries of the Global South toward Western more affluent countries (Organization for Economic Cooperation and Development, or OECD, 2016). The experience of war, atrocities, political persecution, climate change, or utter poverty are among the key push motives that drive people to leave their home country and seek a safer, freer, and generally better future for themselves and their children in another country (Masten et al., 2019).As a result of these migratory flows, the face of Western countries has changed. Most have become ethnically and racially more diverse. They face the challenge of integrating migrants into the fabric of society. However, the presence of migrants is often threatening for local populations. In recent years, nationalist movements use an anti-immigrant rhetoric and agenda to gain power. The public debate over migration in Europe and the United States is at times ferocious (Motti-Stefanidi & Salmela-Aro, 2018). At the same time, in light of increasing life expectancies and decreasing birth rates in Western countries, it is clear that today's immigrant children and youth will become a vital part of the economic future of host societies (Hernandez, 2012). Thus, it is of paramount importance to have well-integrated immigrants, with an emphasis on young immigrants whose future is tied to that of the receiving society.Young immigrants face developmental, acculturative, and social challenges as they grow in the host country. Significant individual differences are observed in the quality of their adaptation in the face of these challenges. The quality of their present adaptation is a