- March 11
- British citizen Henry Jones invents self-raising flour. [5] (March 17 [1])
- March 17
- Rubber band patented by Stephen Perry of London, England. [1] [55.53]
- March 26
- Patent awarded for adhesive medicated plaster, precusor of bandaid. [1]
- March 28
- Mexico drops diplomatic relations with US. [1]
- April 2
- H L Fizeau and J Leon Foucault take first photo of Sun. [1]
- April 10
- More than 1,000 buildings are damaged by fire in Pittsburgh, Pennsylvania, USA. [1]
- May 3
- Fire kills 1,600 in popular theater in Canton, China. [1]
- May 6
- In Ch'ang-shou, Szechwan, China, a stone meteorite damages more than 100 tombs. [521]
- May 14
- Utrecht-Arnhem Railway opens. [1]
- May 20
- First legislative assembly convenes in Hawaii. [1]
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- May 28
- Fire in Québec; 1,500 houses destroyed. [1]
- June 1
- Homing pigeon completes 11,000km trip (Namibia-London) in 55 days. [1]
- July 4
- Texas Congress votes for annexation to US. [1]
- December 29
- US President James Polk signs act admitting Texas into union. [1] [549.56] [1075.40]
1846
- January 1
- Yucatan declares independence from México. [1]
- January 28
- Battle of Allwal, British beat Sikhs in Punjab (India). [1]
- February 10
- British defeat Sikhs in battle of Sobraon, India. [1]
- February 19
- Texas is admitted to the United States of America. [1] [400.94]
- February 20
- British occupy Sikh citadel of Lahore. [1]
- February 23
- Polish revolutionaries march on Cracow, but are defeated. [1]
- April 18
- R.E. House of New York City receives a US patent for the telegraph ticker. [457]
- April 25
- Mexican troops kill and wound American soldiers on patrol near Rio Grande. [549.56]
- May 3
- Mexican army surrounds fort in Texas. [1]
- May 8
- First major battle of Mexican War fought at Palo Alto, Texas. American brigadier general Zachary Talyor's army defeats a much larger Mexican force. [1] [573.84]
- May 9
- American brigadier general Zachary Talyor's army defeats a Mexican force at Reseca de la Palma. [1] [573.84]
- May 13
- US declares war on México, two months after fighting began. [1] [549.56]
- May 18
- US troops attack Rio Grande, occupying Matamoros. [1]
- May 24
- General Zachary Taylor captures Monterrey in Mexican War. [1]
- June 10
- Robert Thomson obtains an English patent on a rubber tire. [1]
- June 14
- California (Bear Flag) Republic proclaimed in Sonoma. [1]
- June 15
- The dispute between the US and Great Britain over the Oregon country is settled by treaty, establishing the boundary at the 49th parallel. [1] [549.56]
- June 19
- In Hoboken, New Jersey, USA, the first baseball game under recognizable modern rules is played (Cartwright Rules); New York Nines 23, Knickerbockers 1. [1] [5] [817.142]
- June 22
- Adolphe Sax of Belgium patents his invention of the saxophone. [1] [457]
- July 7
- US annexes California. [1]
- July 9
- Captain John B. Montgomery claims California area for the USA. [1] [1119.105]
- July 21
- Mormons found first English settlement in California (San Joaquin Valley). [1]
- August 14
- The Cape Girardeau meteorite, a 2.3kg chondrite-type meteorite, strikes near the town of Cape Girardeau, Missouri, USA. [5]
- August 17
- US takes Los Angeles. [1]
- August 18
- General Stephen W Kearney's US forces captures Santa Fe, New Mexico. [1]
- August 22
- US annexes New Mexico. [1]
- September 10
- Elias Howe patents the sewing machine. [1] [5]
- October 10
- Queen Isabella of Spain marries first cousin Francisco de Asis de Bourbon. [1157.91]
- October 16
- At Massachusetts General Hospital in Boston, Massachusetts, USA, Dr. William Thomas Green Morton performs world's first anaesthetization of a patient, then surgeons perform removal of a cyst. [1831.64]
- December 5
- C F Schoenbein obtains patent for cellulose nitrate explosive. [1]
- December 12
- American chargé d'affaires Benjamin Alden Bidleck signs a treaty with the government of President Tomás Cipriano de Mosquera of New Grenada, which in part guarantees to the US exclusive right of transit across the Isthmus of Panama. [722.32]
- December 28
- Iowa admitted as 29th state of the USA. [1]
1847
- January 14
- Conspiracy in New Mexico against US. [1]
- January 24
- 1,500 New Mexican Indians and Mexicans defeated by US Colonel Price. [1]
- February 23
- Battle of Buena Vista, México; American major general Zachary Taylor defeats Mexican General Antonio Lopez de Santa Anna and Mexican army. [1] [573.84]
- February 28
- US defeats México in battle of Sacramento. [1]
- March 1
- Michigan becomes first English-speaking jurisdiction to abolish the death penalty (except for treason against the state). [1]
- March 7
- US General Scott occupies Vera Cruz, Mexico. [1]
- March 18
- First Dutch public telegram. [1]
- March 21
- Antonio López de Santa Anna becomes President (9th time) of Mexico. [118.61]
- March 25
- Pope Pius IX issues encyclical On aid for Ireland. [1]
- March 29
- 12,000 US troops capture Vera Cruz, Mexico. [1]
- April 2
- Antonio López de Santa Anna resigns (9th time) as President of Mexico. [118.61]
- April 14
- Persia and Osmaanse sign second Treaty of Erzurum. [1]
- May 8
- Robert Thompson patents rubber tire. [1]
- May 20
- Antonio López de Santa Anna becomes President (10th time) of Mexico. [118.61]
- May 31
- Rotterdam-Hague Railway opens. [1]
- June 1
- The first Communist political party, the Communist League, convenes in London, England. [55.43]
- July 1
- First US postage stamps go on sale in New York City: 5-cent Benjamin Franklin and 10-cent George Washington. Franklin is the first person in the world other than a head of state to appear on a stamp. [1] [323.17] [700.2] [1135]
- July 14
- In Braunau, Bohemia, a 37-pound iron meteorite smashes through the roof of a house. [521]
- July 24
- Rotary-type printing press patented by Richard March Hoe, New York City. [1]
- July 26
- Liberia declares independence from American Colonization Society. [1] [1266.60]
- August 7
- First railway in Switzerland opens, the Spanish Bun Railway between Zurich and Baden. [1101.595]
- September 14
- US troops under General Scott enter Mexico City. [1]
- September 15
- Antonio López de Santa Anna resigns (10th time) as President of Mexico. [118.61]
- October 1
- Siemens AG is founded. [5]
- November 21
- Steamer Phoenix is lost on Lake Michigan, 200 dead. [1]
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