Empire- a large collection of states or nations ruled by a single, ultimate authority, historically most often an emperor or empress.
Superpower- a country that is immensely prominent and powerful (used especially with reference to the US and the former Soviet Union when these were perceived as the two most powerful nations in the world).
Power- the capacity to perform an action or behave in a specific way, notably as a trait or faculty.
Military power- In a broad sense, the term "military strength" can apply to a nation's armed forces as well as to the ability of a group like a fire team, squad, etc. A military term for a large power.
Nations- a sizable population living in a given nation or region and connected by shared ancestry, history, culture, or language.
Organisations -a group of people who are organised for a certain goal, such as a corporation, society, association, etc.
International- existent, taking place, or being conducted between two or more nations.
Colonialism- the process of gaining full or partial governmental control over another nation, populating it with settlers, and then economically exploiting it.
Mediation- Resolution of a disagreement through intervention; arbitration.
Militarism - the conviction or desire that a nation should keep a potent military and be ready to use it forcefully to protect or advance its interests at all costs.
Negotiation - conversation aiming at coming to a consensus.
Imperialism - a strategy for expanding a nation's power and influence by military force or diplomacy.
Nationalism - affiliation with one's own country and advocacy for its interests, often at the expense or exclusion of those of other countries.
Judicial system - The judiciary, sometimes referred to as the judicial system, judicature, judicial branch, judicative branch, court, or judiciary system, is a system of courts that decides legal issues and applies, defends, and interprets the law in legal proceedings.
Arbitration - the process of resolving a disagreement through arbitration.
Alliances - a partnership or association created for the advantage of both parties, particularly between nations or organisations
Veto power - The veto is the president's authority to reject a bill or joint resolution and halt its passage into law. A law that Congress has enacted must be signed by the president within 10 days (excluding Sundays).