- First signing of the Treaty Of Waitangi (Te Tiriti o Waitangi) on February 6 , 1840 at Waitangi, Northland New Zealand . The treaty between the British Crown and Māori made New Zealand a British Colony and is considered the founding point of modern New Zealand.
- The Webster-Ashburton Treaty , signed August 9 , 1842 , settled the dispute over the location of the Maine-New Brunswick border between the United States and Canada .
- On August 29 , 1842 , the first of two Opium Wars ended between China and Britain with the Treaty Of Nanking . One of the consequences was the Cession of parts of modern day Hong Kong to the British. Hong Kong would eventually be returned to China in 1997 .
- Mexican-American War ( 1846 - 1848 ) was fought between Mexico and the United States Of America . The latter emerged victorious and gained undisputed control over Texas while annexing portions of Arizona , California and New Mexico .
- Wave of Revolution s in Europe . Collectively known as the Revolution Of 1848 . This led to mass emigration of these refugees into industrial cities of the United States as well as to other locations around the world.
- Karl Marx and Friedrich Engels writes '' The Communist Manifesto '', first published on February 21 , 1848 .
In the mid 1840s several harvests failed across Europe, which caused famines. Especially the Great Irish Famine ( 1845 - 1849 ) was severe and caused a quarter of Ireland 's population to die or emigrate to the United States and Canada.
# Nasser-al-Din Shah , 1848- 1896
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