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Q.Why did the Soviet Union, the second most powerful country in the world, suddenly disintegrate ? Explain any six reasons.

(OR)
Explain any three reasons each for the ‘arms race’ as well as the ‘arms control’ during the Cold War.
CBSECBSE Class XII Board 2019Subjective· 6mImportance★★★★★
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Part (a): The USSR disintegrated from economic stagnation, Gorbachev's reforms, nationalism, the 1991 coup, the arms-race/Afghan burden, and the loss of Eastern Europe.

Part (b): The arms race stemmed from the security dilemma, deterrence and ideological prestige; arms control from fear of mutual destruction, cost, and the Cuban Missile Crisis.

Part (a)

The disintegration of the Soviet Union in 1991 resulted from a chain of long-building failures.

First, economic stagnation. By the 1980s the command economy could not keep pace with a modern society; consumer goods were scarce, and the military consumed a vast share of resources. Second, Gorbachev's reforms — Perestroika and Glasnost — meant to revive the system, instead removed old controls and exposed decades of repression, destroying the Party's authority. Third, nationalism in the republics erupted once central control eased; the Baltic states led, followed by Ukraine, Georgia and the Central Asian republics. Fourth, the failed August 1991 coup by hardline communists collapsed within days amid resistance led by Boris Yeltsin, fatally weakening the centre. Fifth, the crushing burden of the arms race and the war in Afghanistan (1979–89) drained the treasury with no gain. Sixth, the loss of the Eastern European empire in 1989 — when Gorbachev refused to prop up communist regimes and the Berlin Wall fell — shattered the myth of Soviet invincibility and made the union's own break-up seem inevitable. …

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