The premise may be true.
The notion that it has happened at this moment in time is not true.
There will probably never be liberal democracies in civilizations that do not “believe in”, among other things, the sovereignty of the individual, universal suffrage, the folly of combining rational government with mystical faith, free markets, expansion of capital, banking systems etc. etc.
As implied in the above post, this is in my opinion where the neocons go wrong. It is probably intrinsic in the human nature to wish to live in a state of personal liberty, with protections granted by law. But unless you have studied, debated freely and openly, or experienced these things, you may not be able to “actualize it”.
Thus it is incorrect to imagine that every oppressed person can be “liberated” on Monday, and know exactly what to do on Tuesday. As an example, my girlfriend is from the Middle East. She knew something was wrong with her life as a female in an oppressive Arab culture, but she could not articulate it well until she came the US, read the words of the enlightenment philosophers, became educated and began to participate in the economy and politics.
If, as a hypothetical, Americans decide to universally accept the idea that history can “end”, and so go on a great adventure and free the world from tyranny, they are going to have to spend two generations governing everyplace they go while the former prisoners figure out how to live. When I went to the ME I sort of thought that’s what I was doing, and what the US was going to do. Given that, I thought it was a good thing.
Unfortunately, the moral difference between this idea and colonialization/imperialism is very is difficult to articulate in a political election cycle, to an electorate that sometimes chooses to not to think about such stuff. Plus, it is stupidly expensive. Thus, the politics of US involvement in the ME have changed, and I have lost interest. I won’t be going back there again.
So, history might eventually end, but it is probably not going to happen in Fukuyama’s time or yours or mine.