Politics puzzle

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Across
  1. 2. institution working on a specific topic
  2. 4. political system ruled by only a few people
  3. 6. document about the framework of a state
  4. 9. set of beliefs trying to explain the world
  5. 11. system with the people as sovereign
  6. 12. law which is supposed to be implemented
  7. 14. group of people trying to get political attention
  8. 15. mechanism to determinde a leader
  9. 17. union of several countries
  10. 18. document between several countries
  11. 19. group of parties who are not in government
Down
  1. 1. organisation and management of a country
  2. 3. head of a state
  3. 5. person responsible for affairs of a thematic area
  4. 7. basic properties an individuum has
  5. 8. survey about the peoples will on a topic
  6. 10. political parties working together
  7. 13. group of people ruling a country
  8. 16. people trying force political change
  9. 20. institution that passes laws