Conversation so far:
when did the first harry potter book come out in the us
Harry Potter and the Philosopher's Stone, the first novel in the Harry Potter series, was published on 1 September 1998 in the US.
was harry potter and the philosopher's stone j. k. rowling's first book
After a number of rejections, J. K. Rowling finally sold her first book, Harry Potter and the Philosopher's Stone.
when was the first harry potter book published in the uk
The first Harry Potter book was first published in the United Kingdom on 26 June 1997

Question: how many copies has the book series sold
Self-contained rewrite: how many copies has the harry potter book series sold