Tsarist Russia period: from the end of 15 to the beginning of 16, a multi-ethnic feudal country with the Grand Duchy of Moscow as the center was gradually formed. 1547, Ivan IV changed the title of Grand Duke to Tsar. 172 1 year, Peter I (Peter the Great) changed the country name to Russian Empire. 186 1 Abolish serfdom. /kloc-from the end of 0/9 to the beginning of the 20th century, it became a feudal imperialist country militarily. Soviet Russia:1965438+In February 2007, the bourgeois revolution overthrew the autocratic system. 1917165438+1October 7 (Russian calendar 65438+1October 25) The October socialist revolution established the first socialist state power in the world-the Russian Soviet Socialist Republic. Soviet period: 1922 12.30, the Russian Federation, Transcaucasia Federation, Ukraine and Belarus established the Union of Soviet Socialist Republics (later expanded into 15 participating republics). 1990 On June 12, the Supreme Soviet of the Russian Soviet Federal Socialist Republic issued the Declaration of State Sovereignty, declaring that the Russian Federation has "absolute sovereignty" within its territory. Russian Federation (now Russia): 199 1 August, the August 19 Incident occurred in the Soviet Union. On September 6, the State Council of the Soviet Union passed a resolution recognizing the independence of Estonia, Latvia and Lithuania. On February 8, 65438, the Commonwealth of Independent States (CIS) was signed by the republics of the Russian Federation, Belarus and Ukraine in Belovezh, announcing the establishment of CIS. 65438+February 2 1, 1 1 The republics of the Soviet Union except Bohai and Georgia signed the Almaty Declaration and the Protocol of the CIS Agreement. On February 26th, 65438, the House of the Republic of supreme soviet of the ussr held its last meeting and declared that the Soviet Union no longer existed. At this point, the Soviet Union disintegrated, and the Russian Federation became a completely independent country and the only successor country of the Soviet Union. 1993 12 February 12. The first constitution of Russia after independence was adopted by referendum, which stipulated that the name of the country was "Russian Federation", which had the same meaning as "Russia".