The crown and its duties

This is a story about a Kingdom in the United States.. Wait actually imagine if the United States were a Kingdom and ruled by a king and Queen, now imagine that the king and queen had two daughters one just turned 16 and got married and left, while the other one has a day before she turns 16 and has to get married and go out into a world she doesnt really know and on top of that with a guy she doesnt really know but is married to. What could possably go wrong?