Who is the author of the Harry Potter series?

J.K. Rowling

What was the first state in the U.S. to recognize Christmas officially? What mammal is known for drinking the blood of livestock at night? In what state is it illegal to dress as a priest or nun on Halloween? What U.S. state celebrates Forefather's Day commemorating Pilgrim ancestors around Thanksgiving? Which common Thanksgiving decoration often represents abundance and is shaped like a horn?