Today in History: On January 18, 2003 over 500,000 protestors showed up in Washington D.C. in opposition to the United States’ planned invasion of Iraq. The protest was the largest in American history since the protests of the Vietnam War. Protests were held around the world in opposition to the war. Over 150,000 showed up in San Francisco and smaller rallies were held in Tokyo, Moscow, Paris, and London. Despite strong opposition to the war, the United States would attack Iraq two months later.