1. what is the main document of the usa? 2. when was the constitution of the usa signed? 3. how many amendments have been added to the constitution since 1787? 4. what does the constitution proclaim? 5. what powers is the federal government given? 6. where is the federal government located? . 7. where is the legislative power vested? 8. how many members are there in the house of representatives? 9. who is the head of the executive power in the usa? 10. how often do the president's elections take place? 11. who deals with foreign affairs in the usa? 12. what does the bill of rights guarantee?