You do know the story of the Argentine Tango. Not sure if it is true, but this is what was told to me:
It comes from the Pampas Region of Argentina which is not the most livable provincce but it produces all those cows making the world reknown beef. Since women did not like the area it was populated by mostly men. So on weekend nights the men did the Euro Tango together, but emphasized the dominance of the the couple in a test of strength. - (this can be seen in old newsreels) When the men travelled to BA, the ladies wanted to learn it that way.