Official minority languages of Sweden
Finnish has been spoken in Sweden ever since the (then provincial) borders were drawn in the 13th century. Sweden has always had a significant migration to and from Finland. As the two languages belong to different language families it is easy to distinguish them, unlike the neighbouring languages Norwegian and Danish. The number of Finnish speakers in Sweden today has been estimated to over 460,000. Even though many current Swedes are of full or mixed Finnish descent, Swedish is the main language in practice for many bilinguals.
Mandatory Swedish
The status of Swedish as a national language in Finland is defined by the Finnish constitution. There was migration of Swedish-speaking peasants to some Finnish coastal areas during the Middle Ages. During this period, when Finland was ruled by Sweden, Swedish language became part of the culture in the coastal areas. Swedish was also the language of the ruling class. The Finnish language was forbidden an official status alongside Swedish until the period of Russian rule (1809–1917), in 1860. The autonomous Åland Islands (pop. 26,000, 95% Swedish, 5% Finnish) has only one official language, Swedish, and the speaking of Finnish between employees is forbidden in some public services.