Boswell's belief that immigrants should be taught English and American customs and ideals when they come to America is based on the idea of assimilation. Assimilation refers to the process of immigrants adopting the language, customs, and values of their new country. Proponents of this view argue that learning English and understanding American customs and ideals can help immigrants integrate into society, find employment, and fully participate in civic life. On the other hand, critics of this perspective argue that immigrants should be allowed to maintain their cultural identities and that diversity enriches society. They believe that promoting multilingualism and multiculturalism can foster understanding and acceptance among different communities.