The past and the future

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Across
  1. 2. An occasion in which people vote to choose someone for a job
  2. 4. Hijacking an airplane, for example
  3. 6. The murder of an important person
  4. 7. A crisis that sweeps the nation
  5. 8. Something accomplished after hard work and planning
Down
  1. 1. Finding a new country, for example
  2. 3. A event in nature that cause damage
  3. 5. A sudden and great change of a system of government