The scorpion rules / Bow, Erin

The teenage princess of a future-world Canadian superpower, where royal children are held hostage to keep their countries from waging war, falls in love with an American prince who rebels against the brutal rules governing their existences.

"Greta is a duchess and crown princess. She is also a Child of Peace, a hostage held by de facto ruler of the world, the great Artificial Intelligence, Tails. This is how the game is played: if you want to rule, you must give your children as a hostage. Start a war and your hostage dies..."--Amazon.com.