19?? These answers all share the same year - can you work it out?

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Across
  1. 2. African-American boxer was born
  2. 6. John Lennon apologised publicly, after declaring The Beatles more popular than ____?
  3. 7. The U.S. announced it will substantially increase the number of its troops in this Asian country
  4. 10. President of the US
  5. 11. The first word of this crossword's year/theme
  6. 13. Actor elected governor of California
  7. 18. A bloody military coup is staged in this African country, in January of this year
  8. 21. ____ 10 - name of the first manmade object to enter lunar orbit.
  9. 23. Cultural revolution started in this country
  10. 25. Classic war film by Gilles Pontecorvo
  11. 27. Losing nation in this years World Cup Final
  12. 29. "Rosencrantz and Guildenstern Are Dead" author
  13. 30. NATO moved their headquarters, from Paris to _____?
  14. 31. Name of The Beatles album released this year
  15. 32. Legendary Cartoonist dies
  16. 33. Word three of this crossword's year/theme
  17. 34. Militant Political Party formed in the US
  18. 35. Arthouse classic by Ingmar Bergman
Down
  1. 1. African-American R&B singer was born
  2. 3. Director of The Good, The Bad & The Ugly
  3. 4. Book written by Jean Rhys, published this year
  4. 5. Name of the dog that found the stolen World Cup trophy
  5. 8. Vincent Cassel, born this year, launched to fame starring in this 1995 French film
  6. 9. This nation won their first and to this date only Football World Cup
  7. 12. Australian Prime Minister that infamously disappeared, elected this year
  8. 14. Drug made illegal in the US this year
  9. 15. Memorable 20th century French President was in office
  10. 16. Adam Sandler, born this year, starred in this 2019 Safdie Brothers film
  11. 17. 2026 celebrates this anniversary of the crossword's theme
  12. 19. Famous writer that threw "The Party of the Century", held in New York City
  13. 20. Word two of this crossword's year/theme
  14. 22. Final Score in the World Cup Final
  15. 24. David Schwimmer, born this year, played this character in "Friends"
  16. 26. Russian author of "Cancer Ward", released this year
  17. 28. Word infamously shouted at Bob Dylan during one of his concerts
  18. 29. "Pet Sounds" was released by this band