One of the reasons Kraft was able to effect its hostile take-over in 2009 was that shares in Cadbury were no longer in the hands of the Cadbury family. For all its proud history, like it or not, Cadbury's was no longer a family business.
The Hershey Company owns the rights to manufacture Cadbury chocolate in the US. It banned imports of British-made Cadbury chocolate in 2015. British expats claim that Cadbury's chocolate in the US tastes nothing like its UK counterpart, but according to Hershey, there's barely any difference in the ingredients.