OK, I am thinking it has to be related to teaching of some sort. Nearly identical with the trends for "World War II" https://g.co/trends/FoSXO
(And, of course, the big spike in August 2015 was the 70th anniversary)
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
(And, of course, the big spike in August 2015 was the 70th anniversary)