There are 2 kinds of peace.
The first is Secular Peace. This kind comes when wars end, conflicts are sorted, and arguments are replaced by understanding.
The second kind is Spiritual Peace. This kind comes from within the soul itself when it is "enlightened" and you make peace with everything that is and everything you are.
Worldly, tangible peace is not guaranteed. Hence the reason news stations don't go out of business. There has always been disorder and pain around.
The only way to maintain any kind of peace consistently is to retain the only peace you have control over -and that's the peace that comes when you make peace with your life.