There are different types of migrations; regardless of typology they directly affect both the migrant and the domicile population. The effects are numerous and while the majority are negative, there are some positive. The cultural contact of the two cultures will result in an acculturation or a process of fusion of cultures. We can tell the difference between two types of acculturation: linear and two-dimensional model. The first is based on the fact that strengthening of ethnic identity is weakened by acculturation and vice versa while other point out that the relations with their dominant group do not depend on each other. Getting in touch with different cultural identities can develop a sense of ignorance and discomfort so called cultural shock. Symptoms of shock were caused by the presence of a person in an unknown environment, divided into four phases, and recognized at three levels: the physical, cognitive and behavioral level. The third part deals with barriers between cultures: ethnocentrism, prejudices and stereotypes, discrimination, social distance. In response to how to deal with migration processes and how to include migrants in the recipient country's society, the integration models are the answer. The models are: total exclusion, differential exclusion, assimilation, pluralistic model. The Republic of Croatia and other countries were also faced with the integration of migrants in a migration crisis that has affected almost the whole Europe. It is not uncommon for fears of terrorism to emerge in such situation, as such crises allow those with other motives to take advantage of this situation to undoubtedly accomplish their goals. Although mostly used as a transit country for this situation, the Republic of Croatia responded unprepared. The decision to want to change, understanding and relationship without racial and ethnic prejudice will create a sense of community and belonging.