Hey bethy: if you're a freakin' history major, you need to think about changing majors--'cause you just flunked the question.
"Bloody Mary" was indeed the daughter of Henry VIII of England--and his first wife, Katherine of Aragon. Who was Spanish--and a CATHOLIC. Mary got pissed because her younger brother Edward VI became king after her father died; he was a Protestant, whose advisors persecuted the Catholics. When Mary became queen after Edward died, she reversed the process--and persecuted the Protestants, because (all together now) SHE WAS A CATHOLIC.
Oh yeah--and I hope you never write an essay that contains such obviously untrue phrases as "killed all the Catholics in England"....They may have gone underground, but nobody ever came close to killing them all.
Stick to the drink, bethy.