Translate the following English sentence to French:
"On one hand, this policy encourages the integration of immigrants where it should favour their assimilation into the culture of the host country. This would prevent the development of ethnic ghettos which are nothing more than urban powder kegs."
D'une part, elle encourage l'intégration des immigrés là où il faudrait favoriser leur assimilation à la culture du pays d'accueil pour éviter l'apparition de ghettos ethniques qui seront autant de poudrières urbaines.