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The Soviet Union, officially the Union of Soviet Socialist Republics was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen national republics; in practice, both its government and its economy were highly centralized until its final years. It was a one-party state governed by the Communist Party of the Soviet Union, with the city of Moscow serving as its capital as well as that of its largest and most populous republic: the Russian SFSR. Other major cities included Leningrad (Russian SFSR), Kiev (Ukrainian SSR), Minsk (Byelorussian SSR), Tashkent (Uzbek SSR), Alma-Ata (Kazakh SSR), and Novosibirsk (Russian SFSR). It was the largest country in the world, covering over 22,402,200 square kilometres (8,649,500 sq mi) and spanning eleven time zones. The country’s roots lay in the October Revolution of 1917, which saw the Bolsheviks overthrow the Russian Provisional Government that formed earlier that year following the February Revolution and the abdication of Tsar Nicholas II, marking the end of the Russian Empire. The new government, led by Vladimir Lenin, established the Russian Socialist Federative Soviet Republic (RSFSR), the world’s first constitutionally guaranteed socialist state. The State Flag of the Union of Soviet Socialist Republics, commonly known as the Soviet flag (Russian: Сове́тский флаг, tr. Sovétsky flag), was the official state flag of the Union of Soviet Socialist Republics (USSR) from 1922 to 1991. The flag’s design and symbolism are derived from several sources, but emerged during the Russian Revolution. The flag is also an international symbol of the communist movement as a whole. The design is a solid field of red adorned with a unique gold emblem in the upper hoist quarter. The red flag was a traditional revolutionary symbol long before 1917, and its incorporation into the flag paid tribute to the international aspect of workers’ revolution. The hammer and sickle design was a modern industrial touch adopted from the Russian Revolution. The union of the hammer (workers) and the sickle (peasants) represents the “victorious and enduring revolutionary alliance”. The emblem is topped by a gold-bordered red star representing the Communist Party of the Soviet Union. 4K Resolution.