As of the start of 1840, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.

Discover what happened in this year with HISTORY’s summaries of major events, anniversaries, famous births and notable deaths. During an exploring expedition, Captain Charles Wilkes …

Historical events from year 1840. Learn about 47 famous, scandalous and important events that happened in 1840 or search by date or keyword.

Jul 2, 2025 · This article will analyze the key events of 1840, focusing on their long-term impact and contextualizing them within the broader narrative of 19th-century American development.

Sep 16, 2024 · Discover 30 fascinating facts about the year 1840, from historical events to cultural milestones that shaped the world. Dive into history now!

January 19, 1840 - Antarctica is claimed for the United States when Captain Charles Wilkes circumnavigates the continent and claims Wilkes Land for the nation.

Over the twenty years between 1820 and 1840 the daily lives of most Americans have improved steadily, with the exceptions of those enslaved in the South and the dispossessed native …