Latgalian language
Originally Latgalians were a tribe living in modern Vidzeme and Latgale. It is thought that they spoke the Latvian language, which later spread through the rest of modern Latvia, absorbing features of the Old Curonian, Semigallian, Selonian and Livonian languages. The Latgale area became politically separated during the Polish–Swedish wars, remaining part of the Polish–Lithuanian Commonwealth as the Inflanty Voivodeship, while the rest of Latvians lived in lands dominated by Baltic German nobility. Both centuries of separate development and the influence of different prestige languages likely contributed to the development of modern Latgalian as distinct from the language spoken in Vidzeme and other parts of Latvia.
Language policy in Latvia
The Electronic Mass Media Law orders to use only Latvian language in the first channels of public radio and television, and basically Latvian language in their second channels (Section 66).
The government of Latvia in its policy documents refers to Latvia as a (democratic) nation state, constructing societal integration on the basis of the Latvian language, while respecting the diversity of languages. Unity block, comprising most of the governing coalition as of 2011, also describes Latvia as a nation state. The idea of the nation state, where "language = nation", is seen as the core and main engine of the language policy of the Latvian state. Critics draw parallels between measures of the Latvian government and the assimilation of linguistic minorities in various countries.