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- united states (4)
- history (3)
- astronautics and state (2)
- outer space (2)
- 研究 (2)
- alliances (1)
- balance of power (1)
- economic development (1)
- economic policy (1)
- forecasting (1)
- geopolitics (1)
- global financial crisis, 2008-2009 (1)
- globalization (1)
- income distribution (1)
- isolationism (1)
- manned space flight (1)
- power (social sciences) (1)
- research (1)
- social aspects (1)
- space flight to the moon (1)
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