Latvian language
The history of the Latvian language (cf. below) has placed it in a peculiar position for a language of its size whereby it is spoken by a large number of non-native speakers as compared to native speakers. The immigrant and minority population in Latvia is 700,000 people: Russians, Belarusians, Ukrainians, Poles, and others. The majority of immigrants came to Latvia between 1940–1991; supplementing pre-existing ethnic minority communities (Latvian Germans, Latvian Jews). In a recent survey, 60% of Latvia's ethnic minorities described their knowledge of Latvian as fluent. Fluency in Latvian is prevalent among the younger generations of the minorities.
Latvian language
According to some glottochronological speculations, the Eastern Baltic languages split from Western Baltic (or, perhaps, from the hypothetical proto-Baltic language) between 400 and 600. The differentiation between Lithuanian and Latvian started after 800, with a long period of being one language but different dialects. At a minimum, transitional dialects existed until the 14th century or 15th century, and perhaps as late as the 17th century.