In 1967, the residents of US-Mexico border town Rio Rico discovered they weren't Mexican citizens but were actually American.
For years it was assumed Rio Rico was part of Mexico, because it lay south of the river that forms the US-Mexico border.
During the Prohibition era, the town became known as a place US citizens could go to freely drink and gamble.
However, prior to 1906, Rio Rico actually lay to the north of the river and was therefore American territory.
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