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Why are some events called "doors"?

The origin of "XX Gate" is because of Watergate Incident.

Watergate incident refers to the political scandal after the illegal activities of the United States and the party government in the 1972 presidential election were exposed.

Watergate is a comprehensive building in Washington. 1972 June 17 Five people were arrested for breaking into the national headquarters of the Democratic Party in the building. Subsequent investigations showed that the Nixon administration took a series of actions to undermine the election process, and the Watergate incident was only one of them. As a result, several government officials were jailed and the president resigned, which was the first time in American history.

Therefore, from then on, the media like to call what happened XX Gate.

To tell you the truth, I don't like the name.