20th century

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Across
  1. 1. power, nucl p er
  2. 3. exploration, ace exp ra on
  3. 5. advances, te n ogical adv
  4. 7. War , pos -Col W
Down
  1. 1. weapons, ear weap
  2. 2. , n ti nali s
  3. 4. War II, Wor Wa
  4. 6. War I, Worl ar
  5. 8. War, Col ar