The defeat of the Ottoman Turks in World War I and the disintegration of the Russian Empire gave the Armenians a chance to declare their independence. On May 28, 1918, the independent Republic of Armenia was established, after the Armenians forced the Turkish troops to withdraw in the battles of Sardarapat, Karakilisse and Bashabaran. Overwhelming difficulties confronted the infant republic, but amid these conditions the Armenians devoted all their energies to the pressing task of reconstructing their country. But due to pressure exerted simultaneously by the Turks and Communists, the republic collapsed in 1920. Finally, the Soviet Red Army moved into the territory (Eastern Armenia) and on November 29, 1920, declared it a Soviet republic. Armenia was made part of the Transcaucasian Soviet Federal Socialist Republic in 1922, and in 1936, it became one of the Soviet Union’s constituent republics. The tumultuous changes occurring throughout the Soviet Union beginning in the 1980′s inevitably had repercussions in Armenia.