Latvian language
The Middle dialect is spoken in central and Southwestern Latvia. Kursenieki language, which used to be spoken along Curonian Spit, is closely related to the varieties of middle dialect spoken in Courland. The dialect is divided into the Vidzeme variety, the Curonian variety and the Semigallian variety. The Vidzeme variety and the Semigallian variety are closer to each other than to the Curonian variety, which is more archaic than the other two. There are three intonations in the Middle dialect. In the Semigallian variety, "ŗ" is still used. Standard Latvian is based on the middle dialect.
Latvian language
During the Soviet occupation (1940–1991), the policy of Russification greatly affected the Latvian language. Throughout this period, many Latvians and Latvia’s other ethnicities faced deportation and persecution. A massive immigration from the Soviet republics of Russia, Ukraine, Belarus and others followed, largely as a result of Stalin's plan to integrate Latvia and the other Baltic republics into the Soviet Union by means of Russian colonization. As a result, the proportion of the ethnic Latvian population within the total population was reduced from 80% in 1935 to 52% in 1989. In Soviet Latvia, most of the immigrants who settled in the country did not learn Latvian. Today, Latvian is the mother tongue of more than 60% of the country's population.