In preparation of Fantastic Beasts and Where to Find Them theatrical release on Nov. 18, 2016, J.K. Rowling releases a four story series titled ‘History of Magic in North America.’ You can read it on Pottermore.
According to Variety, the short stories aim to introduce magical themes about North American’s wizarding world Rowling hasn’t yet explored:
The writing will be posted on Pottermore.com over four consecutive days beginning Tuesday at 6 a.m. PST. The four stories will educate readers on previously little explored themes in the wizarding world: North American witches and wizards, their history and their magic. The video broke simultaneously on selected media sites around the world and links viewers to “History of Magic in North America.” The video and the writing provide context and backstory for the “Fantastic Beasts and Where to Find Them” movie, which stars Eddie Redmayne as Newt Scamander.