But immigrants know that to get a good job they need to speak the local language . Children invariably pick this up at school - often acting as interpreters for their parents. Within a couple of generations, the immigrant community's first language is generally that of their host country. Others worry about the economic impact - nervous that immigrants are going to steal their jobs. Such fears may be understandable but are generally groundless.
Immigration certainly adds to the population size and therefore to the number of job-seekers.
Another economic concern is that immigrants will swamp social services such as education, health and welfare. Refugees who arrive traumatized in their new countries are indeed likely to need considerable support. But other immigrants generally contribute much more in taxes than they take in benefits. Money will need to be spent on the education of immigrant children but adult immigrants are likely to be young and healthy and few will require welfare or pensions. Illegal immigrants, fearing detection, are of course even less likely to use welfare - even though through sales taxes they make a considerable contribution to the public coffers.