US since 45!

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Across
  1. 2. Arthur Serra's greatest need
  2. 4. Mutual guarantee! Nukes!
  3. 9. Only good Cold War theorist
  4. 10. underrating NYTimes game! Try it!
  5. 11. best xmas gift for a strava fanatic
  6. 13. - Chicago grads toppled this South American nation
  7. 14. why 20! is a BIG number
  8. 15. Hierarchy of needs originator
  9. 16. underrated UC
  10. 20. overseas financial sanctions
  11. 22. Silicon Valley city
Down
  1. 1. 2nd best NYT game. Categorize!
  2. 3. top quality stock rating agency
  3. 5. UHS value not starting with "I"
  4. 6. Cia contractor, concatenated
  5. 7. major with a lot of job opportunities
  6. 8. rizzful interview alma mater
  7. 10. Animal Farm antagonist
  8. 11. Peak Friday club
  9. 12. "chat am i ____?"
  10. 17. Yale alums/coke smugglers
  11. 18. 1950s threat to the US
  12. 19. CIA training ground/fun spacial recognition game
  13. 21. Semper ___