sentences:  In the aftermath of the Russian Revolution of 1917, Latvia declared its independence on November 18, 1918.After a prolonged War of Independence, Latvia and Soviet Russia (the predecessor of the Soviet Union) signed a peace treaty on August 11, 1920.In its "Article 2" Soviet Russia "unreservedly recognises the independence and sovereignty of the Latvian State and voluntarily and forever renounces all sovereign rights (...) to the Latvian people and territory."