• Karl Marx writes The Communist Manifesto
• Mexican-American War
• Revolutions in Europe
• Introduction of the postal stamp[?]

World Leaders

• Emperor Ferdinand I (Austria)
• Chancellor Klemens Wenzel von Metternich (Austria)
• Emperor Franz Josef (Austria-Hungary)
• King Louis-Philippe (France)
• Pope Gregory XVI
• Pope Pius IX
• Emperor Nicholas I (Russia)
• Queen Victoria (United Kingdom)
• Prime Minister Lord Melbourne (United Kingdom)
• Prime Minister Sir Robert Peel (United Kingdom)
• Prime Minister Lord John Russell (United Kingdom)
• President Martin Van Buren (United States)
• President John Tyler (United States)
• President James Knox Polk (United States)