Slightly off topic since this article is about Cadbury, but this keeps coming up in this discussion.

American has plenty of good chocolate! Here's an article listing a whole slew of craft chocolatiers: https://www.foodandwine.com/lifestyle/best-chocolate-shops-a...

Other than that, it's exceedingly easy to find Ghirardelli chocolate in particular in grocery stores, Wal-Mart, Target, Walgreens, etc. Many more options are available at high end and specialty stores like organic grocery stores. And, of course, there's always online ordering for the especially dedicated.

Besides all that, there are innumerable chocolate alternative craft candymakers catering to crowds that want alternative sweeteners, fats, etc. They're not really for me, but business seems to be going well for them.