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Here’s a little explanation as to the differences with US chocolate.
The bit about Butyric Acid explains why US chocolate tastes literally like vomit; it’s the component in vomit that gives it the distinctive taste and smell.
When Hershey’s products came to the UK they initially had to be relabelled to reflect the extremely low cocoa content and be called “chocolate flavored candy bar”.
Ironically, the article references Cadbury.