TIL: Sweden joining NATO marks first time in 500 years when all Nordic countries are allied to each other. Last such time was in 1523 when Kalmar Union dissolved.
https://en.wikipedia.org/wiki/Kalmar_Union
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1b9u0pu/til_sweden_joining_nato_marks_first_time_in_500/