This might sound like speculation, but can it be reliably predicted from canon what Voldemort would have done after he won, were he successful in defeating Harry and the Order? Would he just rule over the wizard world and keep up the masquerade, or would he try to take over the whole Earth by starting a (dark-)wizard vs. muggle war? Answer He wouldn't have been content with simply ruling the Wizarding world. Voldemort hated his father for being a Muggle and no doubt resented being a half-blood wizard despite also being the Heir of Slytherin; he even went as far as to adopt a new name to disguise the fact he was related to a Muggle family. I think the new statue in the Ministry of Magic when Voldemort has (secretly) assumed control gives a pretty clear indication of his thoughts about Muggles and what he would have done with them if he'd had free reign to do so: Now a gigantic statue of black stone dominated the scene. It was rather frightening, this vast sculpture of a witch ...