Protests against the Iraq War
Beginning in late 2002 and continuing after the 2003 invasion of Iraq, large-scale protests against the Iraq War were held in many cities worldwide, often coordinated to occur simultaneously around the world. After the biggest series of demonstrations, on February 15, 2003, New York Times writer Patrick Tyler claimed that they showed that there were two superpowers on the planet: the United States and worldwide public opinion.
Source: Wikipedia — Protests against the Iraq War (CC BY-SA 4.0)