The Treasury’s intervention to bolster the yen is the first since 1998, when it bought the currency in order to strengthen Japan’s economy after the yen had dropped to eight-year lows. The US intervened in Japan’s currency in 2011 to weaken it as part of a co-ordinated international effort to prevent a dangerous currency appreciation after the Tohoku earthquake and tsunami.
(From TFA.)
The Asian Financial Crisis of the 1990s was one of several that occurred during that decade (also: the recession triggered by the 1st Gulf War 1992, the Mexican Peso crisis of 1994, the Russian financial crisis of 1998, and arguably the post-dot-com bust in 2001, stretching the decade just a tad). For those present at the time, the dot-com boom was a short-lived (though extravagent) interval, beginning in late 1998, spiking early 2000, and crashing out in early 2001.