| 84001 | July 25 | Event | 1898 – The United States invasion of Puerto Rico begins with U.S. troops led by General Nelson Miles landing at harbor of Guánica, Puerto Rico. |
| 84002 | July 25 | Event | 1908 – Ajinomoto is founded. Kikunae Ikeda of the Tokyo Imperial University discovers that a key ingredient in kombu soup stock is monosodium glutamate (MSG), and patents a process for manufacturing it. |
| 84003 | July 25 | Event | 1909 – Louis Blériot makes the first flight across the English Channel in a heavier-than-air machine from (Calais to Dover, England, United Kingdom) in 37 minutes. |
| 84004 | July 25 | Event | 1915 – RFC Captain Lanoe Hawker becomes the first British military aviator to earn the Victoria Cross, for defeating three German two-seat observation aircraft in one day, over the Western Front. |
| 84005 | July 25 | Event | 1917 – Sir Robert Borden introduces the first income tax in Canada as a "temporary" measure (lowest bracket is 4% and highest is 25%). |
| 84006 | July 25 | Event | 1920 – France captures Damascus. |
| 84007 | July 25 | Event | 1925 – Telegraph Agency of the Soviet Union (TASS) is established. |
| 84008 | July 25 | Event | 1934 – The Nazis assassinate Austrian Chancellor Engelbert Dollfuss in a failed coup attempt. |
| 84009 | July 25 | Event | 1940 – General Henri Guisan orders the Swiss Army to resist German invasion and makes surrender illegal. |
| 84010 | July 25 | Event | 1942 – Norwegian Manifesto calls for nonviolent resistance to the Nazis. |
| 84011 | July 25 | Event | 1943 – World War II: Benito Mussolini is forced out of office by his own Italian Grand Council and is replaced by Pietro Badoglio. |
| 84012 | July 25 | Event | 1944 – World War II: Operation Spring: One of the bloodiest days for the First Canadian Army during the war: One thousand five hundred casualties, including 500 killed. |
| 84013 | July 25 | Event | 1946 – Operation Crossroads: An atomic bomb is detonated underwater in the lagoon of Bikini Atoll. |
| 84014 | July 25 | Event | 1946 – At Club 500 in Atlantic City, New Jersey, Dean Martin and Jerry Lewis stage their first show as a comedy team. |
| 84015 | July 25 | Event | 1952 – The U.S. non-incorporated territory of Puerto Rico adopts a constitution. |
| 84016 | July 25 | Event | 1956 – Forty-five miles south of Nantucket Island, the Italian ocean liner SS Andrea Doria collides with the MS Stockholm in heavy fog and sinks the next day, killing 51. |
| 84017 | July 25 | Event | 1957 – The Republic of Tunisia is proclaimed. |
| 84018 | July 25 | Event | 1958 – The African Regroupment Party (PRA) holds its first congress in Cotonou. |
| 84019 | July 25 | Event | 1959 – SR.N1 hovercraft crosses the English Channel from Calais, France to Dover, England in just over two hours. |
| 84020 | July 25 | Event | 1959 – Lloyd J. Old introduced BCG, a tuberculosis vaccine, into experimental cancer research as a way to stimulate non-specific resistance to tumor growth. BCG was FDA-approved in 1991 and is now widely used as a first line treatment for superficial blad |
| 84021 | July 25 | Event | 1961 – In a speech John F. Kennedy emphasizes that any attack on Berlin is an attack on NATO. |
| 84022 | July 25 | Event | 1965 – Bob Dylan goes electric as he plugs in at the Newport Folk Festival, signaling a major change in folk and rock music. |
| 84023 | July 25 | Event | 1969 – Vietnam War: U.S. President Richard Nixon declares the Nixon Doctrine, stating that the United States now expects its Asian allies to take care of their own military defense. This is the start of the "Vietnamization" of the war. |
| 84024 | July 25 | Event | 1973 – Soviet Mars 5 space probe is launched. |
| 84025 | July 25 | Event | 1976 – Viking program: Viking 1 takes the famous Face on Mars photo. |
| 84026 | July 25 | Event | 1978 – Puerto Rico police assassinate two nationalists in the Cerro Maravilla murders. |
| 84027 | July 25 | Event | 1978 – Louise Brown, the world's first "test tube baby" is born. |
| 84028 | July 25 | Event | 1979 – Another section of the Sinai Peninsula is peacefully returned by Israel to Egypt. |
| 84029 | July 25 | Event | 1983 – Black July: Thirty-seven Tamil political prisoners at the Welikada high security prison in Colombo are massacred by the fellow Sinhalese prisoners. |
| 84030 | July 25 | Event | 1984 – Salyut 7 cosmonaut Svetlana Savitskaya becomes the first woman to perform a space walk. |