1820
1820 — China: September — The Jiaqing Emperor died / United States: Massachusetts divided in two with the admission of Maine as a state
6 events. The text is the source chronology verbatim; the terms are in Sources & licenses. The grey lines above and below are the surrounding 2 years.
| KoreaJoseon 1392–1897 | ChinaQing dynasty 1636–1912 | JapanEdo period 1603–1868 | United StatesUnited States 1776– |
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- No events recorded for this year
- 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.
- Poverty becomes endemic in the Eight Banners
- October — The Jiaqing Emperor's son the Daoguang Emperor became emperor of the Qing dynasty.
| - No events recorded for this year
- 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.
- U.S. presidential election, 1820: James Monroe reelected president unopposed, Daniel D. Tompkins reelected vice president.
- March 4, 1821 – President Monroe and Vice President Tompkins begin their second terms
- 1818Illinois becomes the 21st state
- 1818Battle of Arroyo Grande
- 1818Jackson Purchase
- 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
- 1821Adams–Onís Treaty
- 1821Missouri becomes a state
- 1821Treaty of Chicago
- 1821Florida becomes a U.S. territory; the 1819 Adams–Onís Treaty goes into effect
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