1820年

1820年 — 中国: September — The Jiaqing Emperor died / 美国: Massachusetts divided in two with the admission of Maine as a state

事件6条。正文照录原始年表原文，来源见来源与许可。上下灰色行是前后2年的脉络。

韩国朝鲜王朝 1392–1897	中国清朝 1636–1912	日本江户时代 1603–1868	美国美国 1776–
本年无收录事件 1819화성(華城)의 성문에 괘서가 발생함 1821사현정(四賢井) 중건 1822순흥부사 이의원(李懿遠) 부임 1822봉화현감 박시원(朴時源) 부임	September — The Jiaqing Emperor died.EN Poverty becomes endemic in the Eight BannersEN October — The Jiaqing Emperor's son the Daoguang Emperor became emperor of the Qing dynasty.EN	本年无收录事件 1821伊能忠敬、『大日本沿海輿地全図』を完成させる。	Massachusetts divided in two with the admission of Maine as a state.EN U.S. presidential election, 1820: James Monroe reelected president unopposed, Daniel D. Tompkins reelected vice president.EN March 4, 1821 – President Monroe and Vice President Tompkins begin their second termsEN 1818Illinois becomes the 21st state 1818Battle of Arroyo Grande (1818) 1818Jackson Purchase in Kentucky 1818Cumberland Road opened 1819Alabama becomes the 22nd state in the U.S. 1819McCulloch v. Maryland (17 US 316 1819) prohibits state laws from infringing upon federal constitutional authority 1819Panic of 1819 1819African Slave Trade Patrol 1819Adams-Onís Treaty, including acquisition of Florida 1819Dartmouth College v. Woodward (17 US 518 1819) protects principle of honoring contracts and charters 1821亞當斯—奧尼斯條約 1821Missouri becomes a state 1821Treaty of Chicago 1821Florida becomes a U.S. territory; the 1819 Adams–Onís Treaty goes into effect

韩国朝鲜王朝 1392–1897

中国清朝 1636–1912

日本江户时代 1603–1868

美国美国 1776–

本年无收录事件

1819화성(華城)의 성문에 괘서가 발생함
1821사현정(四賢井) 중건
1822순흥부사 이의원(李懿遠) 부임
1822봉화현감 박시원(朴時源) 부임

September — The Jiaqing Emperor died.EN
Poverty becomes endemic in the Eight BannersEN
October — The Jiaqing Emperor's son the Daoguang Emperor became emperor of the Qing dynasty.EN

本年无收录事件

1821伊能忠敬、『大日本沿海輿地全図』を完成させる。

Massachusetts divided in two with the admission of Maine as a state.EN
U.S. presidential election, 1820: James Monroe reelected president unopposed, Daniel D. Tompkins reelected vice president.EN
March 4, 1821 – President Monroe and Vice President Tompkins begin their second termsEN

1818Illinois becomes the 21st state
1818Battle of Arroyo Grande (1818)
1818Jackson Purchase in Kentucky
1818Cumberland Road opened
1819Alabama becomes the 22nd state in the U.S.
1819McCulloch v. Maryland (17 US 316 1819) prohibits state laws from infringing upon federal constitutional authority
1819Panic of 1819
1819African Slave Trade Patrol
1819Adams-Onís Treaty, including acquisition of Florida
1819Dartmouth College v. Woodward (17 US 518 1819) protects principle of honoring contracts and charters
1821亞當斯—奧尼斯條約
1821Missouri becomes a state
1821Treaty of Chicago
1821Florida becomes a U.S. territory; the 1819 Adams–Onís Treaty goes into effect