You are correct, Storm04.10.
In keeping with my civil rights comparison, the various states had their own laws governing race as late as the early 1960s. With the passage of the Civil Rights Act of 1964, those laws were all swept off the books by the U.S. Congress.
In the case of "states rights" re: marriage, it was not until 1967 when the Supreme Court declared any ban on interracial marriage to be unconstitutional (
Loving v. Virginia), using the Fourteenth Amendment's Equal Protection clause as the basis of its decision.
What makes that decision interesting in light of the present-day struggle is there is no comparable Equal Rights Amendment* governing gender the way the 14th Amendment dealt with race. But the Supreme Court could use its own decision in
Loving v. Virginia as a precedent in deciding for gay marriage since in it they declared marriage to be one of the "basic civil rights of man".
It will be interesting to see how this plays out in the coming decades.
*We tried and failed in the '70s