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Historical Events in 1820 - On This Day
1820 Archives - HISTORY
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Timeline of the history of the United States (1820–1859)
What Happened from 1820 to 1829 - The People History
What Happened in 1820 - On This Day
American History Timeline: 1820-1829 - ThoughtCo
What Happened In 1820 - Historical Events 1820 - EventsHistory
1820 - Wikipedia