In Spain there has been a process more or less like this, leaving aside the II Republic:
Civil Registries were created in the XIX century, as in much of the rest of Europe (Switzerland for example) they were a way to put in the hands of Caesar something which had, until then, been the province of God; namely, registries of births, deaths and marriages. For the next 100+ years someone could get a Civil Marriage or get a Catholic Marriage (which doubled up as a Civil one). If you got married by a different religion, you needed to do the paperwork yourself to get the marriage recognized by the State; after all, the majority of people used to want a church wedding, so making them do the paperwork twice was rightly perceived as a bad publicity move on the part of those who didn’t want the church wedding.
Fast forward to the mid-1970s. Divorce is reintroduced (it had existed during the II Republic).
1980s, the Socialist government says that priests aren’t allowed to do the paperwork for “their” weddings any more: if you get a Catholic wedding, you need to go to the Civil Registry in person as well. This backfires, leading to the birth of a new form of marriage when some people realize that they can get “the marriage that matters” (to them) without losing the bride’s widow’s pension; others go this same “Catholic wedding only” route because their taxes will be lower if they file as two single people than as a married couple. In turn, this leads to a tax reform by which married couples can choose to file jointly or separatedly.
In the 1990s, some towns start “de facto couples registries.” While the couples registered there don’t get the same benefits as those registered in State registries, this is viewed as a way to allow those who can’t legally marry (same gender; one of them is in a bad divorce; etc) to register their relationship. It’s also a way to pressure the State into preparing laws which can end those bad situations.
2003, one of the Socialist Party’s promises in their campaign is same-sex marriage; they win and fulfill that promise as soon as legally able to do so.
PP (the other largest party, social-democrat) has, as they in turn promised, sued that reform; this is not so much an attempt at getting rid of it (which makes their most backward bases happy) as… to reinforce it through challenging it. You see, once they (who after all are pretty moderate) have sued and the judges have said that this law is within the Constitution’s boundaries, other people can’t sue again. Double jeopardy, if you want.
I once saw an interview with Mayor Oreja where a reporter asked “the next time PP is in Govenrment, will you repeal this law?” Mayor Oreja’s answer was “of course not!” and his eyes said “are you NUTS?”
PP has no interest in having a situation similar to what California has now, of having people who have been married until the 2004 law but which aren’t allowed to do so under a theoretical future law.
The largest ruckus re this was caused by a children’s program (Los Lunis) when they represented a same-sex marriage; while I’m all for SSM, I agree with the people who protested that it’s absurd to have a program where the ONLY previous relationship between characters was friends and neighbors (no siblings, parents, nothing) and then go and pull, of all possible relationships that two people can have with each other, the one that still smelled of the printer’s ink.
“De facto” registries still exist and are now viewed as “marriage lite.” Funny thing is, those who use them by choice are pushing for full marriage rights… :smack: so go and do the full paperwork, genius!