As of the start of 1804, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.

Learn about 48 famous, scandalous and important events that happened in 1804 or search by date or keyword.

In 1804, Haiti proclaimed its independence from France, becoming just the second independent nation in the Americas, after the United States.

What happened in the year 1804 in history? Famous historical events that shook and changed the world. Discover events in 1804.

The United States presidential election of 1804 pitted incumbent Democratic-Republican President Thomas Jefferson against Federalist Charles Cotesworth Pinckney.

Jan 12, 2026 · Lewis and Clark Expedition (1804–06) was a U.S. military expedition, led by Captain Meriwether Lewis and Lieutenant William Clark, to explore the Louisiana Purchase and the Pacific …

Jul 3, 2024 · It was a year that saw the rise of influential leaders, groundbreaking scientific achievements, and notable cultural milestones. This timeline provides a detailed account of the key …

In 1804 the United States was growing rapidly in population as well as territory. The 1800 census indicated that the nation was composed of about 5.3 million people.

November 3 – The Treaty of St. Louis (1804) is signed by Quashquame and William Henry Harrison; controversy surrounding the treaty eventually causes the Sauks to ally with the British during the War …

As Jefferson began organizing his administration, he ignored Burr's patronage recommendations and did not consult him on policy decisions. In 1804, aware that he would not be a part of the national …