Definitions We Should All Know

Nationality: the status of belonging to a particular nation, whether by birth or naturalization: the nationality of an immigrant.

Jus soli: (Latin for "right of the soil" or, somewhat figuratively, "right of the territory"), or birthright citizenship, is a right by which nationality or citizenship can be recognised to any individual born in the territory of the related state.

Jus sanguinis: (Latin: right of blood) is a social policy by which nationality or citizenship is not determined by place of birth, but by having an ancestor who is a national or citizen of the state. It contrasts with jus soli (Latin for "right of soil").

Nationality law: is the branch of law concerned with the questions of nationality and citizenship, and how these statuses are transmitted, acquired, or lost.
By custom, states have the right to determine who its nationals are. Such determinations are usually made by custom, statutory law, or case law (precedent), or some combination.

Article 15 of the Universal Declaration of Human Rights states:

1.Everyone has the right to a nationality.

2.No one shall be arbitrarily deprived of his nationality nor denied the right to change his nationality.

Ethnicity: 1. ethnic traits, background, allegiance, or association.