The last two pre-war days, it must have been a strange time (although people in Athens probably weren't bothered much until 1917). Interesting Smithsonian article!
Rob, weird thing is that it was just by chance that I selected that card for posting on the centennial of the beginning of World War I. I previously had only glanced over the card. When I posted it, I happened to notice the postmark indicated a date two days after the war started. Indeed, the USA was reluctant to enter the conflict in Europe. The Archduke's "death car" license plate matter in the Smithsonian article is sure spooky.