Province in the context of "Provinces of Equatorial Guinea"

A capital city, or just capital, is the municipality holding primary status in a country, state, province, department, or other subnational division, usually as its seat of government. A capital is typically a city that physically encompasses the government's offices and meeting places; the status as capital is often designated by law or a constitution. In some jurisdictions, including several countries, different branches of government are in different settlements, sometimes meaning there are multiple official capitals. In some cases, a distinction is made between the official (constitutional) capital and the seat of government.

English-language media often use the name of the capital metonymically to refer to the government sitting there. Thus, "London–Washington relations" is understood to mean diplomatic relations between Great Britain and the United States.

A state is a political entity that regulates society and the population within a definite territory. Government is considered to form the fundamental apparatus of contemporary states.

A country often has a single state, with various administrative divisions. A state may be a unitary state or some type of federal union; in the latter type, the term "state" is sometimes used to refer to the federated polities that make up the federation, and they may have some of the attributes of a sovereign state, except being under their federation and without the same capacity to act internationally. (Other terms that are used in such federal systems may include "province", "region" or other terms.)

A political union is a type of political entity which is composed of, or created from, smaller polities or the process which achieves this. These smaller polities are usually called federated states and federal territories in a federal government; they are called prefectures, regions, or provinces in the case of a centralised government. This form of government may be created through voluntary and mutual cession and is described as unionism by its constituent members and proponents. In other cases, it may arise from political unification, characterised by coercion and conquest. The unification of separate states which, in the past, had together constituted a single entity is known as reunification. Unlike a personal union or real union, the individual constituent entities may have devolution of powers but are subordinate to a central government or coordinated in some sort of organization. In a federalised system, the constituent entities usually have internal autonomy, for example in the setup of police departments, and share power with the federal government, for whom external sovereignty, military forces, and foreign affairs are usually reserved. The union is recognised internationally as a single political entity. A political union may also be called a legislative union or state union.A union may be effected in many forms, broadly categorized as:

• Incorporating union
• Incorporating annexation
• Federal union
• Federative annexation
• Mixed unions

A federated state (also state, province, region, canton, land, governorate, oblast, emirate, or country) is a territorial and constitutional community forming part of a federation. A federated state does not have international sovereignty since powers are divided between the other federated states and the federal government. Unlike international sovereign states, which have what is often referred to as Westphalian sovereignty (such as exercised by their federal government), federated states operate under their domestic or federal law with relation to the rest of the world.

Federated states do not have automatic standing as entities of international law. Instead, the federal union (federation) as a single entity is the sovereign state for purposes of international law. Depending on the constitutional structure of a particular federation, a federated state can hold various degrees of legislative, judicial, and administrative jurisdiction over a defined geographic territory and is a form of regional government. A federated state may nonetheless establish offices internationally, for example, to promote trade or tourism, while still operating only within the trade policy or other applicable law of their federation, and their host country. They also may enter into international regional agreements under the laws of their federation and state, such as to protect a cross-border resource like water or other shared matters.

Canada has ten provinces and three territories that are sub-national administrative divisions under the jurisdiction of the Canadian Constitution. In the 1867 Canadian Confederation, three provinces of British North America—New Brunswick, Nova Scotia, and the Province of Canada (which upon Confederation was divided into Ontario and Quebec)—united to form a federation, becoming a fully independent country over the next century. Over its history, Canada's international borders have changed several times as it has added territories and provinces, making it the world's second-largest country by area.

The major difference between a Canadian province and a territory is that provinces receive their power and authority from the Constitution Act, 1867 (formerly called the British North America Act, 1867). Territories are federal territories whose territorial governments have powers delegated to them by the Parliament of Canada. Powers are divided between the Government of Canada (the federal government) and the provincial governments by the Constitution Act, either exclusively or concurrently. A change to the division of powers between the federal government and the provinces requires a constitutional amendment. A similar change affecting the territories can be performed unilaterally by the government or Parliament of Canada.

Federalism is a mode of government that combines a general level of government (a central or federal government) with a regional level of sub-unit governments (e.g., provinces, states, cantons, territories, etc.), while dividing the powers of governing between the two levels of governments. Two illustrative examples of federated countries—one of the world's oldest federations, and one recently organized—are Australia and Micronesia.

Johannes Althusius (1563–1638) is considered the father of modern federalism, along with Montesquieu. In 1603, Althusius first described the bases of this political philosophy in his Politica Methodice Digesta, Atque Exemplis Sacris et Profanis Illustrata. By 1748, in his treatise The Spirit of Law, Montesquieu (1689-1755) observed various examples of federalist governments: in corporate societies, in the polis bringing villages together, and in cities themselves forming confederations. In the modern era Federalism was first adopted by a union of the states of the Old Swiss Confederacy as of the mid-14th century.

ISO 3166 is a standard published by the International Organization for Standardization (ISO) that defines codes for the names of countries, dependent territories, special areas of geographical interest, and their principal subdivisions (e.g., provinces or states). The official name of the standard is Codes for the representation of names of countries and their subdivisions.