As an American, it's really weird hearing (blanket statement repeated ad nauseum) how liberal Europe is while seeing countries only just now legalizing marriage. And I realize that the U.S. only defends marriage at a federal level because our courts decided it was a constitutional protection.
It's a common mistake. The European Union is more liberal because it needs to be to fulfil it's purpose. The individual countries are more liberal at government level to get that sweet funding. Internally however, we were pretty much conservative until recent years. Then the older generations started to change and only now do the doors start to open. Kind of.
The current state of affairs isn't helping much.
Most of Europe is somewhere between liberal and conservative, just like the US.
The main differences are that in Europe, social democracy is more established than in the US (i.e. Bernie Sanders Democrats actually hold seats here), but also that in the US, the younger generation is much more left than Europe. (i.e. Bernie Sanders would top the under 30 polls in the US, but he would not become prime minister in Sweden, as the coalition in power in sweden right now is actually further right than Biden.)
IDK how it is in other EU countries, but before we had same sex marriage, we had registered partnerships, with all the same legal rights and benefits as marriage. The only difference was that it wasn't called a marriage. Now it's called marriage also for same sex couples, so that last tiny difference is finally gone.
Does that reflect same sex partnerships in USA? Like visits to hospitals that require marriage was NEVER an issue here. Is that still discriminated against in USA, just to harass a minority?