Have any large scale cultural or ideological shifts ever been successfully reversed by those who opposed it?

My example is in Australia in my home state of Victoria. Two days ago, after 20 years of struggle, voluntary euthanasia became legal. It uses the Oregon model of the US. It allows self admimistered euthanasia for terminally ill people. Or certified doctors udner strict conditions can administer the euthanasia drugs.

The first attempt in Australia to pass a euthanasia bill was in the late 1990's in the Northern Territory. This was complex because there were two issues: euthanasia and its status as a territory. The opposition from the Australian Federal Government wasn't just loud - it was vicious. They stopped the Northern Territory from having euthansaia. But more than that a rump of religious, conservative politicians passed a bill that stopped the Northern territory from being able to attempt passing the bill again! That still applies 20 years later! That is vicious!

Now to my amazement I am in a state that is one of the few places in the world with legal euthanasia. I never thought that I would live to see it. As a supporter of it since the early 90's I am happy. Passing it involved getting votes from both sides of state poltiics including religious and conservative law makers who decided to support it.

It's not done and dusted yet. It is law. But there are some nasty party tricks that the conservative, often religious Australian Federal government could attempt. They could block the importation of the euthanasia drugs. They have done this in other issues such as safe injecting room trials for drug addicts.

The reason for most people not knowing about this historic event is that law makers have learnt to keep it a low profile; one of the mistakes of the Northern Territory in the 90's was to draw attention to it. For instance they allowed "euthanasia tourism". Whereas in this law only people who have lived in Victoria for a long time are allowed to access it.

What a struggle over 20 years to allow people to finally have the right to decide how they die with a terminal illness that causes severe pain. Everyone in Victoria who was involved is a hero.

In the Byzantine Empire, iconoclasm was a significant cultural and ideological shift in the 8th century that was successfully reversed in the mid-9th century after an unsuccessful reversal earlier. It's quite possible that this happens most easily in monarchies, for obvious reasons.

Another example would be the reversal of religious toleration in 17th century France, with the revocation of the Edict of Nantes.

More broadly you could view the counter-Reformation through this lens, at least in places like Austria, where significant cultural shifts toward Protestantism were reversed

I'll answer this with a firm, clear, "yes and no."

First, in an important sense the question answers itself: for a shift to be seen as large scale, it will usually have to be big enough that it can't be reversed. If it can be reversed, then history will probably look back and say that it was just a small movement that ultimately failed. (Can you really make a useful distinction between a movement that blossomed and failed and one which succeeded and was then rolled back?)

Secondly, history rarely (maybe never) repeats. The very fact of a cultural shift changes the culture enough so that even if it's ultimately undone in large part, it has a long-term effect.

Thirdly, sure. There are lots of cases:

• Nazism. In 1939 it looked like it was here to stay. It had adherents world-wide. Modern Germans -- nearly everyone -- is now repelled by it.

• Communism. Many intellectuals in the US and Europe were convinced communists in the 1930s and Khrushchev was still planning to bury us as late as 1960. Who is actually a communist today other than a few elderly people?

• Look at the changes in sexual attitudes in England: Puritanism in the 1600s, the Regency in the early 1800s, Victorian morals later in the same century, and England was swinging 75 years later. You'd almost get whiplash.

• On a much smaller scale, fear of crime led to a big law and order movement featuring long sentences in the US in the late 1900s. Now a consensus seems to be developing that this wasn't a very good idea and the laws are starting to be rolled back.

• Japan was isolationist for centuries, then imperialist for 75 years, and now has been almost pacifist for another 75 years.

I think you'll find that there are many ideas which gain a following, sometimes a very big following, and then disappear. And there are many others that just keep on going.