Historical event

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Across
  1. 3. The formation of the European Union.
  2. 5. The dissolution of the Soviet Union.
  3. 6. - The French Revolution begins.
  4. 7. The signing of the Declaration of Independence.
  5. 8. The Korean War.
  6. 10. - The Brexit referendum.
  7. 12. 1856-1860 - The Opium Wars.
  8. 14. The Louisiana Purchase.
  9. 15. The signing of the Treaty of Tordesillas.
  10. 16. The Battle of Saratoga.
  11. 17. The Battle of Trafalgar.
  12. 18. The Arab Spring.
  13. 21. The Battle of Stalingrad.
  14. 22. - The attack on Pearl Harbor.
  15. 23. The Nuremberg Trials.
  16. 26. - Columbus' first voyage to the Americas.
  17. 27. - The California Gold Rush.
  18. 29. - The assassination of Archduke Franz Ferdinand.
  19. 31. - The Spanish Civil War.
  20. 33. BC The founding of the Roman Republic.
  21. 34. - The English Civil War begins.
  22. 36. The assassination of Abraham Lincoln.
  23. 38. - The Treaty of Versailles.
  24. 39. - The Great Fire of London.
  25. 40. - D-Day: The Allied invasion of Normandy.
  26. 41. - The Meiji Restoration in Japan.
  27. 42. century BC - 17th century AD The construction of the Great Wall of China.
  28. 43. - The signing of the Magna Carta.
  29. 44. - The Battle of Lepanto.
  30. 45. - The Suez Canal opens.
  31. 47. The construction of the Panama Canal.
Down
  1. 1. - The Russian Revolution.
  2. 2. - The Wall Street Crash.
  3. 4. The Battle of Antietam.
  4. 6. - The Battle of Waterloo.
  5. 7. The Cuban Revolution.
  6. 9. The Treaty of Brest-Litovsk.
  7. 11. The 9/11 terrorist attacks.
  8. 12. The Holocaust.
  9. 13. - The American Revolution begins.
  10. 15. The Boston Tea Party.
  11. 16. - The Protestant Reformation begins.
  12. 19. The founding of the United Nations.
  13. 20. - The fall of Constantinople.
  14. 21. The Treaty of Westphalia ends the Thirty Years' War.
  15. 23. The Cuban Missile Crisis.
  16. 24. The signing of the Treaty of Ghent.
  17. 25. - Napoleon crowns himself Emperor of France.
  18. 27. The Apollo 11 moon landing.
  19. 28. - The founding of the League of Nations.
  20. 30. The Battle of Gettysburg.
  21. 31. The Vietnam War.
  22. 32. - The Emancipation Proclamation.
  23. 35. The COVID-19 pandemic.
  24. 36. The Cultural Revolution in China.
  25. 37. - The dropping of atomic bombs on Hiroshima and Nagasaki.
  26. 44. The fall of the Berlin Wall.
  27. 46. The Rwandan Genocide.
  28. 47. The signing of the Treaty of Utrecht.