What countries were against the Holocaust?

This is hard to say because many, if not all, the countries had absolutely no clue what the Nazi Party were doing to the Jews. When they found the extermination camps of course all countries were completely shocked. Even many of the German population had no idea of the extermination camps (that's how well hidden and kept Hitler had made them) and American soldiers would take Germans into the camps to show them the extent of what Adolf Hitler, their leader, had done.