Sociolinguistics takes such issues as language rights and language and nationalism into great consideration. Since there are different varieties of the same language within a country, people tend to favor one (usually standard) variety over the others. The role of sociolinguistics is to speak for the rights of speakers of all languages.
Informative conversation with K. David Harrison, assistant professor of linguistics at Swarthmore College near Philadelphia and the author of the new book "When Languages Die: The Extinction of the World's Languages and the Erosion of Human Knowledge".
The application of sociolinguistics to educational problems is absolutely essential as it can help us better understand the relationships between languages and schools, and help make necessary improvements in education through the development of a curriculum that would welcome the cultural and linguistic diversity of all students.