Since the 19th century, France has received many immigrants. These have been mostly male foreign workers from European Catholic countries who generally returned home when not employed. During the 1970s France faced economic crisis and allowed new immigrants (mostly from the Maghreb) to permanently settle in France with their families and to acquire French citizenship. It resulted in hundreds of thousands of Muslims (especially in the larger cities) living in subsidised public housing and suffering from very high unemployment rates. Simultaneously France renounced the assimilation of immigrants, where they were expected to adhere to French traditional values and cultural norms. They were encouraged to retain their distinctive cultures and traditions and required merely to integrate.