What does imperialism have to do with Charlie and the Chocolate Factory?

Answer 1

Willy Wonka conquers the homeworld of the Oompa-Loompas, and forces the natives to work in his sweatshop masquerading as a chocolate factory. He gets them hooked on cocoa so if they try to escape, they get withdrawal symptoms. He tells visitors that he has done it for their own safety and that they need cocoa to live.

(This is, of course, not part of the books or the movies, where Willy Wonka may be exploiting the Oompa-Loompas, but does prevent them from falling prey to the predators and normal-sized natives of the fictitious Loompa region. In early versions of the book, they were dark-skinned pygmies, and might have been considered Willy's slaves.)