The most logistically complex event in Sweden’s history was when Sweden switched their entire traffic system from the left side of the road to the right side in a single day in 1967 called “Dagen H”.
Homosexuality was still classified as an illness in Sweden in 1979. Swedes protested by calling in sick to work, claiming they felt gay.
After French soldier Jean Bernadotte showed kindness to a few Swedish soldiers, he became so popular in Sweden that the Swedes decided to make him their king when a vacancy came up, despite him never having set foot in Sweden before. The House of Bernadotte rules Sweden to this day.