Chocolate is native to the Americas and started to spread around the world in the 17th century, so it makes sense that most languages use the same word, as it is a quite recent addition.
True, but you could say the same thing about e.g. pineapple, which has a bunch of different words for it.
Chili peppers, tomatos, and potatos (among others) are all from the Americas, but have their own names in every area they've spread to, or have taken the name of something else. Why is chocolate different?