Dot-com bubble: Refers to the rapid rise and subsequent collapse of many internet-based companies during the late 1990s and early 2000s.
9/11: The terrorist attacks that occurred on September 11, 2001, resulting in significant changes to U.S. foreign policy and national security measures.
Iraq War: A conflict that began in 2003 when a U.S.-led coalition invaded Iraq to remove Saddam Hussein from power.