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1840 - Wikipedia
U.S. History Timeline: The 1840's - America's Best History
1840 in the United States - Wikipedia
1840s - Wikipedia
Historical Events in 1840 - On This Day
Timeline of Events From 1840 to 1850 - ThoughtCo
United States presidential election of 1840 - Britannica
How Harrison Won the Election of 1840 - ThoughtCo
Post-Revolutionary America: 1800–1840 | Essay | The Metropolitan …
1840 Census Records | National Archives