1) In the late 1990s, the world feared technological catastrophe on January 1, 2000 due to the Y2K bug, but the bug caused no issues and the new millennium was celebrated globally.
2) The 2000 US presidential election between Al Gore and George W. Bush was one of the closest in history and mired in controversy over ballot irregularities in Florida.
3) The terrorist attacks of September 11, 2001 devastated the United States and sparked major military operations abroad in Afghanistan and Iraq.