Fascinating comparison of popular acceptance of non-traditional (in some jurisdictions, they were called “Deviant”) marraiges.
Note how the slopes of the lines showing legality and popular acceptance have shifted. Not just change, but the rate of change has accelerated.
This suggests to me a more progressive attitude on Social Issues. Add Marijuana legalization to the mix and the United States — at least socially — is looking more like certain European countries . . .