December 9th: A Day of Firsts, Declarations, and Revelations December 9th has been marked by a series of significant firsts, declarations of war, medical triumphs, cultural releases, and revelations in sports. Here's a look at some of the key events that occurred on this day: 1851: Establishment of the First North American YMCA - The first YMCA in North America was founded in Montreal, marking the beginning of its influential role in community development. 1868: First Traffic Lights in London -