Knowledge Spectra

United States Declares War on Japan (1941): Following the attack on Pearl Harbor, the United States officially entered World War II on December 8, 1941, after Congress passed a declaration…

Signing of the Belavezha Accords (1991): The Belavezha Accords, signed on December 8, 1991, marked the dissolution of the Soviet Union and the establishment of the Commonwealth of Independent States…

John Lennon's Assassination (1980): On December 8, 1980, John Lennon, the legendary musician and member of the Beatles, was tragically shot and killed outside his home in New York City.…

Delaware Ratifies the U.S. Constitution (1787): Delaware became the first state to ratify the U.S. Constitution on December 7, 1787. This milestone marked the beginning of the process for establishing…

Royal Opera House Opening (1732): The Royal Opera House, a major performing arts venue in London, opened its doors on December 7, 1732. Since its inauguration, it has become one…

U.S. Declares War on Austria (1917): The United States declared war on Austria-Hungary on December 7, 1917, becoming the 13th country to do so during World War I. This action…

Pearl Harbor Attack (1941): On December 7, 1941, Japanese bombers launched a surprise attack on the U.S. naval base at Pearl Harbor in Hawaii. This devastating strike resulted in significant…

Demolition of the Babri Masjid (1992): On December 6, 1992, the Babri Masjid, a 16th-century mosque in Ayodhya, India, was demolished by a large group of Hindu nationalists. This act…

NASA Releases Mars Photographs (2006): On December 6, 2006, NASA released stunning photographs of Mars, captured by the Mars Global Surveyor. These high-resolution images provided unprecedented details of the Martian…

Mongol Siege of Kyiv (1240): The Mongol Siege of Kyiv, a pivotal event in the Mongol invasion of Kievan Rus', occurred on December 6, 1240. The Mongol forces, led by…