http://en.wikipedia.org/wiki/Denmark%E2%80%93Sweden_relation...
http://en.wikipedia.org/wiki/Denmark%E2%80%93Sweden_relation...
"According to science, ..." and "in Sweden, they have..."
For anyone not familiar with the relationship: the two countries are closer than most neighbouring States in the US are; language is so close that people speak their own in conversation (think US vs. British English) and not only going from one country to the next is simpler and cheaper than going across London, but there is less identity checks.
Here is a non-exhaustive list: http://en.wikipedia.org/wiki/Dano-Swedish_war
[0] The Hundred Years' War sort of ruins the statistics in terms of years at war.
In fact, do the English like anyone at all..?
We're amazingly tolerant, living in peace when surrounded by people we don't like ;)