Year in Pictures: 2001

April:
Leaders of 34 American nations, including President Bush, found themselves besieged by anti-globalization protestors at the Summit of the America's in Quebec City, Canada. The protests followed last year's riots in Seattle and set the stage for the violent showdown in Genoa in the summer, as demonstrators sought to challenge free trade and a global economic order they consider unjust.

• Photos: Remembering 9/11: Evolution of Ground Zero