The idea that immigrants that are part of large groups are not able to conserve their language and culture without the help of the foreign state is flawed.  First of all, on the broadest level large immigrant groups come from countries with big population and their culture or language is not in danger of any kind. Just to take a couple of examples, Turkey has almost a 76 million population, while Mexico has a population of almost 120 million.  Secondly, there is no clear link between education in the mother tongue and the willingness of the people to conserve their own culture. Those who are educated in the language of the culture in which they are living are just as likely to be interested about their roots and culture as those in their mother tongue.  Thirdly while there may be a link between language and thought does this extend on to culture; are Japanese unable to enjoy and take part in Taiko drumming if they don’t speak the language as well as the language of their host nation? Only in a few areas, like literature is it vital and if someone is interested in the literature of their mother country they will learn the language as a part of that interest.  Finally this assumes that all immigrants should desire to preserve their own culture rather than partake in the culture of the country to which they have migrated. Integration is the best solution. In order to achieve integration for large immigrant groups you need to convince them to be opened towards your national culture and language and not make them learn in their mother tongue.