Forced assimilation is a process of forced
cultural assimilation of religious or ethnic
minority groups, into an established and generally larger
community. Also enforcement of a new language in legislation, education, literature, worshiping counts as forced assimilation. Forced assimilation can, and has been, used both by minorities against majority as well as the opposite.
Unlike Ethnic cleansing isn't the local population forced to leave a certain area. Instead the population becomes assimilated by force. It has often been used after an area has changed nationality, often in the aftermath of war. Some examples are both the German and French forced assimilation in the provinces
Alsace and (at least a part of) Lorraine, and some decades after the Swedish conquests of the Danish provinces
Scania,
Blekinge and
Halland the local population was submitted to forced assimilation.