The first Arlington High School was in Poughkeepsie before being moved to the more rural Lagrangeville, New York.

Arlington High School is a public high school in the Arlington Central School District located in Lagrangeville, New York, United States, on Route 55.

* December 13 – Wold Newton meteorite: A meteorite falls at Wold Newton, a hamlet in Yorkshire in England.

The addition of the name " Cross " to the area's name originates from the Eleanor cross erected in 1291 – 94 by King Edward I as a memorial to his wife, Eleanor of Castile, and placed between the former hamlet of Charing and the entrance to the Royal Mews of the Palace of Whitehall ( today the top of Whitehall on the south side of Trafalgar Square ).

In the Aceramic Neolithic ( without pottery ), 7000 – 6000, a hamlet of 25-50 persons existed at the location of the Central Court.

This process would be extended by Nash in planning groups of buildings, the first example being Blaise Hamlet ( 1810 – 1811 ), here a group of nine asymmetrical cottages were laid out around a village green, Nikolaus Pevsner described the hamlet as ' the ne plus ultra of the Picturesque movement '.

* Berne – The largest hamlet in the Town, it is located at the intersection of New York State Route 443 and New York State Route 156.

* East Berne – A hamlet east of Berne village on New York State Route 443.

* Reidsville – A hamlet in the southeast part of the town.

* South Berne – A hamlet near the south town line.

* West Berne – A hamlet near the west town line and west of Berne village on New York State Route 443.

* East Township – A hamlet in the northeast part of the town on Route 146.

* Knox ( formerly " Knoxville ") – The hamlet of Knox is in the south part of the town, located at the junction of State Route 156 ( Berne-Altamont Road ) and County Road 252 ( Knox Cave Road ).

* West Berne – A hamlet at the town line in the southwest part of the town.

* West Township – A hamlet in the northwest part of the town on Route 146.

* Clarksville – A hamlet in the southwest part of the town on Route 443.

* Feura Bush – A hamlet in the southeast part of the town, south of Unionville.

* New Salem – A hamlet west of New Scotland village.

* Slingerlands – Part of this hamlet is in the Town of New Scotland that is south of Voorheesville.

* Onesquethaw – A hamlet south of Clarksville.

* Unionville – A hamlet by the east town line.

* Dormansville – A hamlet near the east town line.

* Ford Corners – A location north of Westerlo hamlet.

* Lambs Corner – A hamlet in the southwest part of the town.

* Newry – A hamlet at the south town line.

* South Westerlo – A hamlet near the south town line.

* Westerlo – The hamlet of Westerlo is near the center of the town.

* 1861 – American Civil War: Battle of Wilson's Creek – the war enters Missouri when a band of raw Confederate troops defeat Union forces in the southwestern part of the state.

* C. l. clepticus: San Pedro Martir coyote – northern Baja California and southwestern California

* C. l. impavidus: Durango coyote – southern Sonora, extreme southwestern Chihuahua, western Durango, western Zacatecas, and Sinaloa

* C. l. mearnsi: Mearns coyote – southwestern Colorado and southern Utah south to northern Sonora and Chihuahua

The Isua greenstone belt in southwestern Greenland contains the oldest known rocks on Earth, dated at 3. 7 – 3. 8 billion years old.

The Wassoulou or Wassulu empire was a short-lived ( 1878 – 1898 ) empire, led by Samori Ture in the predominately Malinké area of what is now upper Guinea and southwestern Mali ( Wassoulou ).

* 1490 – John of Kastav finishes a cycle of frescoes in the Holy Trinity Church in Hrastovlje ( now southwestern Slovenia ).

With Lusitania ( and Asturia and Gallaecia ), Rome had completed the conquest of the Iberian peninsula, which was then divided by Augustus ( 25 – 20 BC or 16-13 BC ) into the eastern and northern Hispania Tarraconensis, the southwestern Hispania Baetica and the western Provincia Lusitana.

The Wassoulou or Wassulu Empire was a short-lived ( 1878 – 1898 ) empire, led by Samori Ture in the predominately Malinké area of what is now upper Guinea and southwestern Mali ( Wassoulou ).

* 1999 – The southwestern portion of Oklahoma City, Oklahoma is devastated by an F5 tornado, killing forty-five people, injuring 665, and causing $ 1 billion in damage.

* 1754 – French and Indian War: in the first engagement of the war, Virginia militia under 22-year-old Lieutenant Colonel George Washington defeat a French reconnaissance party in the Battle of Jumonville Glen in what is now Fayette County in southwestern Pennsylvania.

Mesopotamia ( from the: " between rivers "; ( bilād al-rāfidayn ); ( beth nahrain ): " land of rivers ") is a toponym for the area of the Tigris – Euphrates river system, corresponding to modern-day Iraq and to a lesser extent northeastern Syria, southeastern Turkey and smaller parts of southwestern Iran.

The only Slovenian military airport is the Cerklje ob Krki Air Base near the Slovenia – Croatia border in the southwestern part of the country.

* 2005 – Hurricane Rita makes landfall in the United States, devastating Beaumont, Texas and portions of southwestern Louisiana.

* February 16 – WWII: Altmark Incident: The British destroyer pursues the German tanker Altmark into Jøssingfjord in southwestern Norway.

* December 18 – Richard Wetherill and his brother-in-law discover the Indian ruins of Mesa Verde in southwestern Colorado.

* August 31 – A total solar eclipse is visible from northern Canada through northeastern Vermont, New Hampshire, southwestern Maine, and the Capes of Massachusetts.

* January 31 – February 1 – The North Sea flood of 1953 kills 1, 836 people in the southwestern Netherlands ( especially Zeeland ), 307 in the United Kingdom and several hundred at sea, including 133 on the ferry in the Irish Sea.

* Heavy massive rain, landslides, and flooding in western and southwestern Japan kill an estimated 2, 566, and injure 9, 433, mainly at Kizugawa, Wakayama, Kumamoto and Kitakyushu ( June – August ).

* July 6 – First recorded eruption of Manam Volcano ( erupting frequently since then ), forming a 10-km-wide island in the Bismarck Sea, 13 km off coast of Papua New Guinea, in the southwestern part of the Pacific Ring of Fire.

* 1255 – Hulagu Khan is dispatched by his brother Möngke Khan to destroy the remaining Muslim states in southwestern Asia.

* July 13 – John of Kastav finishes a cycle of frescoes in the Holy Trinity Church in Hrastovlje ( now southwestern Slovenia ).

** Pinaleños ( lived south of Bavispe, between the Bavispe River and Aros River in NE Sonora and NW Chihuahua, controlled the Sierra Huachinera, Sierra de los Alisos and Sierra Nacori Chico, the mountains had a large stock of pine forest – hence they were called Pinery Apaches, southwestern local group ).