What are the social consequences of migration?

This question is looking for both the positive and negative social effects of migration for the origin country and receiving country so this a good way to structure your answer. The country people are migrating from can suffer from a loss of young economically active males,altering the demographic, reducing economic growth and potentially pushing the area into decline and splitting up families creating tensions. However, this could empower females filling in for the males, e.g. Polish female firefighters and create a stronger sense of community. The country people are migrating to may need these migrants to support an ageing population e.g. Germany, different cultures bring different cuisines and traditions to the country but can be met with resistance and conflict from indigenous citizens. Moreover, a sudden influx can put pressure on health and education systems e.g. Peterborough School has 27 different languages, straining resources.