Take suffrage as an example :-
initially, only white male property owners could vote
then all white males
then women as long as they were property owners
then freed slaves
then all women etc etc etc etc
Marriage ? - same thing
the age of consent has varied.
Since the founding of the country, marriage between whites and persons of color was seen as immoral and unnatural.
In 1948, the California Supreme Court became the first state high court to declare a ban on interracial marriage unconstitutional.
In 2015, we "redefine the game" again to remove even more irrational prejudice and discrimination.
Great stuff !
I have no doubt that those who are weeping, wailing and gnashing their teeth over the current change are today's equivalents of the Luddites of yore who opposed fairness and equity then.