The Original 6 era from 1942 to 1967 sticks out the most, with no change in teams from the folding of the Brooklyn Americans to the addition of the "Expansion 6." The league's rapid growth from 1967 onward, but particularly the "Sun Belt" era from the early 1990s onward, also stands out. It makes you realize just how young the NHL as we know it really is.
97 years of NHL expansion in one simple map
The NHL's entire history set to the tune of Brass Bonanza. Perfect.