As of the start of 1800, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.

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Historical events from year 1800. Learn about 37 famous, scandalous and important events that happened in 1800 or search by date or keyword.

May 2, 2025 · October 16, 1859: Abolitionist John Brown (1800–1859) leads a raid on Harpers Ferry, Virginia, hoping to initiate a revolt of enslaved people. This revolt would put the U.S. on the path to war.

In the early 1800s, the world witnessed significant changes and events that shaped the course of history. The Industrial Revolution was in full swing, transforming societies from agrarian-based …

On November 1, 1800, President John Adams, in the last year of his only term as president, moved into the newly constructed President’s House, the original name for what is known today as the...

United States presidential election of 1800, American presidential election held in 1800, in which Democratic-Republican Thomas Jefferson was elected as the country’s third president after …

Events from the year 1800 in the United States. January 7 – The Virginia General Assembly adopts the Report of 1800, a resolution drafted by James Madison arguing for the sovereignty of the individual …

What happened and who was famous in 1800? Browse important and historic events, world leaders, famous birthdays and notable deaths from the year 1800.

The 1800s (pronounced "eighteen-hundreds") was a decade of the Gregorian calendar that began on 1 January 1800, and ended on 31 December 1809.