The decision was made by 424 member astronomers of the International Astronomical Union (IAU) in August 2006, in Prague. The two options were to either keep Pluto as a planet and add a number of other small astronomical objects among the planets, or keep having an inconsistent definition for what a planet is.

I think it was the right choice, because it's good to have a consistent definition for a planet, and also excluding one planet is less trouble than adding many more.
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