On This Day in History Explore a verified historical anniversary for today’s date. Human History Timeline prioritizes curated facts from its own timeline and uses Wikipedia’s selected On This Day feed as a fallback when needed. Today in history — October 9 Image: Post of Bolivia — Public domain — Wikimedia Commons

On October 9, 1874, representatives of 22 countries signed the Treaty of Bern, establishing the General Postal Union, which later became the Universal Postal Union. Source · Explore related history For broader context, browse the World History Timeline or the History Topic Timelines . About this feature: Dates and wording are reviewed for historical context, and source links are provided whenever available. See Sources & Editorial Standards .