Important Historical Events of the year 1818, Year 1818 in History

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List of 1818 Major News Events in History, Most Important Historical Events in 1818

What happened in the year 1818?

Date	Event
January 2, 1818	The British Institution of Civil Engineers is founded by a group of six engineers; Thomas Telford would later become its first president.
January 15, 1818	A paper by David Brewster is read to the Royal Society, belatedly announcing his discovery of what we now call the biaxial class of doubly-refracting crystals.
February 5, 1818	Jean-Baptiste Bernadotte ascends to the thrones of Sweden and Norway.
February 12, 1818	Bernardo O'Higgins formally approves the Chilean Declaration of Independence near Concepción, Chile.
March 30, 1818	Physicist Augustin Fresnel reads a memoir on optical rotation to the French Academy of Sciences, reporting that when polarized light is "depolarized" by a Fresnel rhomb, its properties are preserved in any subsequent passage through an optically-rotating crystal or liquid.
April 4, 1818	The United States Congress, affirming the Second Continental Congress, adopts the flag of the United States with 13 red and white stripes and one star for each state (20 at that time).
April 5, 1818	In the Battle of Maipú, Chile's independence movement, led by Bernardo O'Higgins and José de San Martín, win a decisive victory over Spain, leaving 2,000 Spaniards and 1,000 Chilean patriots dead.
April 16, 1818	The United States Senate ratifies the Rush–Bagot Treaty, limiting naval armaments on the Great Lakes and Lake Champlain.
April 19, 1818	French physicist Augustin Fresnel signs his preliminary "Note on the Theory of Diffraction" (deposited on the following day). The document ends with what we now call the Fresnel integrals.
July 4, 1818	US Flag Act of 1818 goes into effect creating a 13 stripe flag with a star for each state. New stars would be added on 4th of July after a new state had been admitted.
July 29, 1818	French physicist Augustin Fresnel submits his prizewinning "Memoir on the Diffraction of Light", precisely accounting for the limited extent to which light spreads into shadows, and thereby demolishing the oldest objection to the wave theory of light.
September 7, 1818	Carl III of Sweden–Norway is crowned king of Norway, in Trondheim.
October 20, 1818	The Convention of 1818 is signed between the United States and the United Kingdom, which settles the Canada–United States border on the 49th parallel for most of its length.
December 3, 1818	Illinois becomes the 21st U.S. state.
December 13, 1818	Cyril VI of Constantinople resigns from his position as Ecumenical Patriarch under pressure from the Ottoman Empire.
December 24, 1818	The first performance of "Silent Night" takes place in the church of St. Nikolaus in Oberndorf, Austria.