Imagine, you're playing with Austria. After a long war with Prussia, you've finally taken Brandenburg. Guess, what happens the very next turn? Of course, your long time trading partner, one province minor, Hanover, declares war. Ok, beating Hanover is no problem. 2 turns later - no more Hanover. But what next? You and I know, that give it a turn or two, and Denmark will declare war or Westphalia (just because you share a border with them; for some reason, Denmark does not see the small strip of border with Brandenburg as a "real border").
One solution would be to give it to a protectorate, but then, Denmark or Westphalia would declare war on the protectorate, effectively dragging you into the war that you were trying to avoid. Another solution: give it to an ally (Britain or UP). But then again, you're likely to have the very ally turn an enemy because of the shared border. So, here is the solution that the current sorry state of diplomacy balance forces upon a player who does not want to conquer the world (for game-playing reasons): give the buffer zone to some obscure, faraway power who is NOT an ally of yours (so you wouldn't be dragged into wars if someone attacked it). In my game, such a faction was Persia.
Persia has had Hanover for 15 years now. Denmark and Westphalia have been extremely happy with their Asian neighbor while Austria has secured peace on their Western border. Silly, I know, but this seems to be the only way (spare conquering the whole lot) to secure a calm front on the Central European map in 1.3.1.
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