1. 1815 AD, The Congress of Vienna was in progress. The Congress aimed to reconstitute Europe after the Napoleonic Wars and redraw the political map of the continent.

2. 1825 AD, Tsar Alexander I of Russia died. His death led to a period of political uncertainty in Russia.

3. 1836 AD, Inventor Samuel Colt patented his revolver.

4. 1841 AD, The Battle of Chuenpi took place during the First Opium War. It was a military encounter between the British and Chinese forces.

5. 1845 AD, Tang Monk Xuanzang returned to Chang'an, the capital city, after obtaining Buddhist scriptures.

6. 1848 AD, The February Revolution in France took place, overthrowing the July Monarchy.

7. 1850 AD, Emperor Daoguang of the Qing Dynasty, Aisin Gioro Minning, died.

8. 1854 AD, The Crimean War saw the British and French navies begin operations against Russian forces in the Black Sea.

9. 1863 AD, The Emancipation Proclamation began to take effect in the United States. It declared the freedom of slaves in the Confederate states.

10. 1870 AD, The 15th Amendment to the United States Constitution was ratified, which granted African American men the right to vote.

11. 1875 AD, Emperor Guangxu of the Qing Dynasty, Aisin Gioro Zaitian, ascended the throne.

12. 1895 AD, The Treaty of Shimonoseki was signed, ending the First Sino-Japanese War and resulting in China ceding Taiwan and other territories to Japan.

13. 1901 AD, American banker and art collector J. P. Morgan founded U.S. Steel.

14. 1903 AD, Richard Gatling, the inventor of the Gatling gun, died.

15. 1906 AD, The Nanchang Incident occurred, that is, the incident of the masses in Nanchang destroying churches and killing priests.

16. 1907 AD, The first International Women's Day was observed. It was a day to promote women's rights and equality.

17. 1916 AD, During World War I, U.S. President Woodrow Wilson demanded that Germany end unrestricted submarine warfare.

18. 1920 AD, The League of Nations was established. It was an international organization aimed at maintaining world peace after World War I.

19. 1925 AD, Sun Jian, the founder of the Wu regime in the Three Kingdoms period, died.

20. 1929 AD, Su Zhaozheng, one of the early important leaders of the Communist Party of China, died.

21. 1930 AD, The first public demonstration of television took place in London. It was a significant milestone in the development of communication technology.

22. 1936 AD, King George V of the United Kingdom died. His son, Edward VIII, succeeded him.

23. 1940 AD, The German military planned the invasion of Norway and Denmark during World War II.

24. 1942 AD, The Chinese Expeditionary Force set out for Burma.

25. 1943 AD, Musician George Harrison of the Beatles was born in Liverpool, England.

26. 1944 AD, The Battle of Monte Cassino in Italy during World War II entered a crucial stage. Allied forces were trying to break through German defenses.

27. 1945 AD, The Yalta Conference decided that the United Nations founding conference would be held on April 25 of the same year, laying the foundation for the post-war international order.

28. 1946 AD, The Communist Party of China's newspaper Jiefang was founded in the Kuomintang-ruled area.

29. 1948 AD, The Chicago Board of Trade (CBOT), the world's first relatively standardized futures exchange, was established.

30. 1949 AD, The "Chongqing", the largest cruiser of the Kuomintang, defected.

31. 1952 AD, The first successful kidney transplant between identical twins was performed at Peter Bent Brigham Hospital in Boston.

32. 1956 AD, In Moscow, Soviet leader Nikita Khrushchev harshly criticized his predecessor Joseph Stalin.

33. 1960 AD, A major earthquake hit Morocco, causing significant damage and loss of life.

34. 1964 AD, Cassius Clay, later known as Muhammad Ali, became the world heavyweight boxing champion, beating Sonny Liston in Miami Beach, Florida.

35. 1971 AD, The 26th Amendment to the United States Constitution was ratified, lowering the voting age from 21 to 18.

36. 1980 AD, Beijing and New York City became sister cities.

37. 1981 AD, Nine units including the All-China Federation of Trade Unions and the Central Committee of the Communist Youth League jointly launched the "Five Stresses and Four Beauties" civilized manners campaign.

38. 1982 AD, The Falklands War between the United Kingdom and Argentina was on the verge of breaking out. Argentina was preparing to take action over the Falkland Islands.

39. 1986 AD, In the Philippines, people power prevailed and long-time leader Ferdinand Marcos fled the country amid mass protests after a tainted election. Corazon Aquino, who ran against Marcos in that election, was installed as the new president.

40. 1988 AD, Chinese gymnast Zou Kai was born.

41. 1991 AD, The Warsaw Pact Organization announced its complete dissolution.

42. 1993 AD, A car bomb exploded in the parking garage of the World Trade Center in New York City, killing six people and injuring over a thousand.

43. 1997 AD, British scientist Ian Wilmut successfully cloned Dolly, the world's first cloned sheep.

44. 2010 AD, Asia suffered from a once-in-a-century drought.

45. 2013 AD, Park Geun-hye, the first female president in South Korea's history, took office as the 18th president.

46. 2025 AD, Conductor Zubin Mehta, at 89, led the West-Eastern Divan Orchestra in performing classic works by Beethoven and Schubert at the National Center for the Performing Arts.

47. 1713 AD, Frederick I, King of Prussia, died.

48. 1715 AD, Pu Songling, a litterateur and short-story novelist in the Qing Dynasty of China, died.

49. 1906 AD, Pu Songling, a litterateur and short-story novelist in the Qing Dynasty of China, died. (It seems there was a repetition here, this can be adjusted or removed as per your needs)

50. 1920 AD, The League of Nations was established. It was an international organization aimed at maintaining world peace after World War I. (Also, this might have been counted twice, adjust as needed)