How many Countries did the witch hunt?

It was a vile process of genocide that swept much of Europe in the 16th & 17th Centuries- principle nations involved were England, France, Spain, Germany and other Northern European nations, although some Central European countries such as present-day Romania, Poland and Hungary were also involved. It is one of the biggest genocidal campaigns in history, comparable to the Holocaust and Stalin's purges in it's intensity- over 9 million people died horribly, most of them women but including some men and even, I'm sorry to say, children and even animals. The USA also conducted witch-hunts in the early years of it's existence, but on a lesser scale than was done in Europe- it began and ended later in the US, dying out in the early 19th Century. The famous Salem Witch Trials were amongst the last to be conducted in the US.