The nation is a community of people who share a common identity, history, culture, and language, often defined by its borders or shared values and beliefs. A state is a political entity with a government, defined territory, and population, and a monopoly on the legitimate use of force within its territory. A country is a sovereign state recognized by other countries, while a nation is a cultural group. A nation-state is a political unit where the state, a centralized political organization, and the nation, a community based on a common identity, are congruent. This concept is more precise than "country," as a country does not need to have a predominant national or ethnic group. A nation is a group of people who are linked by similar values and beliefs, as well as a common identity, history, culture, and language. A state is a political entity having a defined population, a government, and the exclusive right to use force legally inside its borders. A country is a sovereign entity recognized by other countries, while a nation is a cultural group. A nation-state is a political entity in which the nation, a group of people united by a shared identity, and the state, a centralized political organization, are congruent. This idea is clearer than "country," as a country need not have a dominating national or ethnic group. The concept of a nation-state, such as the United States, is a unique entity with a diverse population, including Native Americans and recent immigrants. However, China, despite its official claims to represent all its citizens, is not a nation-state due to its diverse ethnic groups and unique culture. The concept of a nation-state has been tested by immigration and globalization, and it may evolve to accommodate more diverse populations or even cease to exist in some nations.