This example was also far from universal, certainly across the entire USA but even in Louisiana.
edit: reading other comments, it isn't clear whether this information is even true for a small subset of Louisiana 60+ years ago
Spousal rape started to be criminalized in the 1970s, but it took until 1993 for it to be criminalized in every state (https://en.wikipedia.org/wiki/Marital_rape_in_the_United_Sta...). Oklahoma and South Carolina were the two holdouts. It's still treated differently under the law in many states.
The Supreme Court struck down sodomy laws in 2003. (https://en.wikipedia.org/wiki/Lawrence_v._Texas)
Same sex couples couldn't marry in every state until 2015. (https://en.wikipedia.org/wiki/Obergefell_v._Hodges) Some counties in the usual states ignored the ruling for years.
There are still some significant gaps in federal protection. Gender identity and sexual orientation are protected in the workplace and for housing, but not elsewhere.