A Dynastic Union occurs when two or more separate states are ruled by the same monarch, often through marriage or inheritance. This arrangement allows the states to maintain their own laws and governments while sharing a common royal family. Dynastic unions can lead to increased political stability and cooperation between the states involved. Historically, many European countries experienced dynastic unions, such as the union between Scotland and England under James VI of Scotland and I of England in 1603. These unions can significantly impact the political landscape, influencing alliances, conflicts, and the eventual formation of larger states.