State relations refer to the interactions and diplomatic engagements between sovereign states, encompassing treaties, alliances, and conflicts that shape political and economic dynamics. In the context of state building from 1648 to 1815, these relations were heavily influenced by the aftermath of the Thirty Years' War, the rise of absolutism, and the emergence of nation-states. The balance of power became a key concept during this period, as states sought to maintain sovereignty and territorial integrity while navigating complex alliances and rivalries.