... 2003, then-Secretary of State Colin Powell urged the Security Council to authorize military intervention in Iraq. In a statement that would prove unsuccessful, Powell claimed that intervention was necessary because the country, then led by Saddam Hussein, possessed chemical (left) and other weapons of mass destruction. (image credit) It's a claim that later Powell admitted "misled.") Most intriguing: Though Powell's statement can be found at nongovernmental sites like CNN.com and YouTube, a Google search suggests that all official records have been removed from the web. See, e.g., here.
... 2008, is Día de la Constitución in Mexico (coat of arms at right). The national holiday commemorates the 1917 proclamation of the Mexican Constitution. According to this website, it's "considered by many to be one of the most radical and comprehensive constitutions in modern political history."