Treaty of Tordesillas: The Treaty of Tordesillas is an example of international diplomacy during the Early Modern era when Spain and Portugal agreed to divide newly discovered lands outside Europe between them.
Balance of power: The balance of power refers to an equilibrium maintained among competing states through alliances or actions taken by one state to counterbalance another's growing influence.
Diplomatic immunity: Diplomatic immunity is a privilege granted to diplomats, protecting them from prosecution and allowing them to carry out their diplomatic duties without fear of interference.