Politics puzzle

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