An interesting graphic from Bloomberg showing how fast social change has happened in the US on various issues.
Inter-racial marriage bans took 180 years to abolish, with around 35 states doing so until the Supreme Court ruled in 1967.
Prohibition took 75 years to get over-turned.
It took around 30 years from the first state to allow women the vote, to the 20th amendment.
It took only a few years for states to start allowing abortion, before Roe v Wade in 1973. arguably that is still so hotly contested as federal action occurred at a time when less than 20 states allowed it.
Same sex marriage has gone from 0 to 36 states in just a few years. And we will get a Supreme Court decision on it this year.