Portal:United States/Anniversaries/April/April 25
- 1846 – In what becomes known as the Thornton Affair, open conflict begins over the disputed border of Texas, triggering the Mexican–American War.
- 1898 – The United States congress officially declares war on Spain. Combat in the Spanish–American War, however, had begun four days prior.
- 1938 – U.S. Supreme Court delivers opinion in Erie Railroad Co. v. Tompkins that overturns a century of federal common law.
- 1944 – The United Negro College Fund is incorporated.
- 1953 – Francis Crick and James D. Watson publish Molecular structure of nucleic acids: a structure for deoxyribose nucleic acid describing the double helix structure of DNA (pictured).
- 1959 – The St. Lawrence Seaway, linking the North American Great Lakes and the Atlantic Ocean, officially opens to shipping.
On this day for the United States
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Events
- 1846 - Thornton Affair: Open conflict begins over the disputed border of Texas, triggering the Mexican–American War.
- 1847 - The last survivors of the Donner Party are out of the wilderness.
- 1861 - American Civil War: The Union Army arrives in Washington, D.C.
- 1862 - American Civil War: Forces under Union Admiral David Farragut capture the Confederate city of New Orleans.
- 1864 - American Civil War: Battle of Marks' Mills.
- 1898 - Spanish–American War: The United States declares war on Spain.
- 1901 - New York becomes the first U.S. state to require automobile license plates.
- 1938 - U.S. Supreme Court delivers opinion in Erie Railroad Co. v. Tompkins and overturns a century of federal common law.
- 1944 - The United Negro College Fund is incorporated.
- 1945 - Elbe Day: United States and Russian troops meet in Torgau along the River Elbe, cutting the Wehrmacht of Nazi Germany in two, a milestone in the approaching end of World War II in Europe.
- 1945 - The U.S. Army blows the swastika from the top of the Zeppelintribüne.
- 1945 - Fifty nations gather in San Francisco to begin the United Nations Conference on International Organizations.
- 1953 - Francis Crick and James Watson publish Molecular structure of nucleic acids: a structure for deoxyribose nucleic acid describing the double helix structure of DNA.
- 1959 - The St. Lawrence Seaway, linking the North American Great Lakes and the Atlantic Ocean, officially opens to shipping.
- 1961 - Robert Noyce is granted a patent for an integrated circuit.
- 1983 - American schoolgirl Samantha Smith is invited to visit the Soviet Union by its leader Yuri Andropov after he read her letter in which she expressed fears about nuclear war.
- 1983 - Pioneer 10 travels beyond Pluto's orbit.
- 1990 - The Hubble Space Telescope was deployed from Space Shuttle Discovery into orbit.
- 2007 - The Dow Jones Industrial Average hit 13,000 for the first time in history, closing at 13,089.89