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1820年代（せんはっぴゃくにじゅうねんだい）は、西暦（グレゴリオ暦）1820年から1829年までの10年間を指す十年紀。 できごと [ 編集 ] 中南米の スペイン ・ ポルトガル 植民地が相次いで独立する。
September 30 – The Convention of 1800, or Treaty of Mortefontaine, is signed between France and the United States of America, ending the Quasi-War. October 1 – In the Third Treaty of San Ildefonso, Spain returns Louisiana to France. U.S. President John Adams becomes the first president of the United States to live in the Executive Mansion ...
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1820: The Argentine Confederation establishes a penal colony in the Malvinas. February 8, 1826 – Unitarian Bernardino Rivadavia becomes the first President of Argentina. Chile. February 6, 1820 – Lord Cochrane occupies Valdivia in the name of the Republic of Chile.
Niépce developed heliography, a technique he used to create the world's oldest surviving products of a photographic process. [3] In the mid-1820s, he used a primitive camera to produce the oldest surviving photograph of a real-world scene.
0–9. 1800 in the United States. 1801 in the United States. 1802 in the United States. 1803 in the United States. 1804 in the United States. 1805 in the United States. 1806 in the United States. 1807 in the United States.
1718: The city of New Orleans is founded by the French in North America. 1718: Blackbeard (Edward Teach) is killed by Robert Maynard in a North Carolina inlet on the inner side of Ocracoke Island. 1718 – 1730: Tulip period of the Ottoman Empire. 1719: The Spanish attempt to restart the Jacobite rebellion fails.
1820年（1820 ねん）は、西暦（グレゴリオ暦）による、土曜日から始まる閏年。 他の紀年法 [ 編集 ] この節は、 ウィキプロジェクト 紀年法 の ガイドライン に基づいて記述されています。
