And how did they achieve/maintain that?

There?s always war somewhere... or you mean peace in one country?

That's what they say. I hoped it wasn't true LOL.

We've had World Wars I & II;
has there ever been World Peace?

Otherwise one continent or country will have to do.

Peace? Never..

There are always confrontation here and there if not war.

Particular country not sure.. China had acquired a long term of golden era during Tang dynasty, where the nation is experiencing prosperous growth in art and culture.. and it last for something like 200 years?

dont think there has ever been peace totally except for adam and eve before the fall.
but in the milennium there will be 1000 years of peace.

A country can have a gentle culture like tibet or thailand where they have a peaceful nature and practice tai chi, meditation etc but there are always troublemakers.

Yes, Tibet was neutral until China conquered it,
like the Netherlands was neutral until Germany conquered it.

I think Switzerland (and Lichtenstein) have been neutral for a while.

I guess the troublemakers keep reincarnating, and they screw up every time.