Lincoln signs the Emancipation Proclamation, Ellis Island opens, the Rose Bowl becomes the first college bowl game, Hank Williams dies, and the Y2K panic fizzles out, all on this day.
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European Union
1999: The euro is officially introduced as an accounting currency, replacing the former European Currency Unit at a ratio of 1:1. However, actual physical euro coins and banknotes wouldn't enter circulation until three years later, on Jan. 1, 2002.