The emergence of the USSR as a superpower after World War II can be attributed to several key factors, but from the options provided, the most relevant ones include:
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Its quick recovery and rebuilding efforts after suffering extensive war damage: Following WWII, the USSR was able to rebuild its economy and infrastructure rapidly, partly due to its centralized planning and state control over resources. The industrial capacity that was developed during the war was leveraged effectively in the post-war period.
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The complete absence of military opposition across both Europe and Asia: After the war, the USSR expanded its influence significantly by establishing satellite states in Eastern Europe and asserting its power in Asia, particularly in countries like Mongolia and later, China. The weakened state of Western Europe and the lack of immediate military opposition allowed the USSR to solidify its status.
While the discovery of vast oil reserves contributed to the Soviet economy, and while the USSR did have a unique form of governance, it did not transition to a democratic government after the war. Instead, it continued as an authoritarian regime under Communist rule. Thus, the most accurate contributing factors from your options are the recovery and rebuilding efforts, as well as the absence of military opposition.