The Queen does it again. Any true fan knows that J. K. is very politically driven and opinionated. We always witnessed hints, Easter eggs, and similarities in her books that related to the real world. When the Minister of Magic secretly meets with the British Prime Minister, the whole fandom lost its mind. You mean wizards have something to do with actual world politics? well, yes, as it turned out, and quite more than any of us was aware of. 
 Obviously, seeing as the wizarding world is human - or well mostly, along with other humanoid entities - politics have to be a part of it. J. K.'s fascinating break down of how each MoM had a reputation - much like the real ones - and how many of them actually had relationships with well-known real-life political figures. 
 Artemisia Lufkin First female Minister of Magic 
 Evangeline Orpington A good friend of Queen Victoria's... 
 Archer Evermonde In post during the Muggle First World War... passed emergency legislation forbidding witches and wizards to get involved... Thousands defied him. 
 Leaonard Spencer-Moon Enjoyed a good working relationship with Winston Churchill 
 All these and more just help make the wizarding world that much more real to readers. 
 The chapter about Umbridge wasn't new to me seeing as I have read it before on Pottermore - and no doubt, the rest is there as well, which is why I didn't give any of the Pottermore Presents series a full five. Still, for those who hadn't read it before, discovering the history of characters like Slughorn and Umbridge gives more depth to liking and hating them respectively. 
 So again, like my previous comments in both reviews of the Pottermore Presents books, pick them up, read them, enjoy, then open up Pottermore and read some more.