Articles 6 and 7 provide:
6. A person born in or outside Zambia after the commencement of this constitution shall become a citizen of Zambia at the date of his birth if on that date at least one of his parents is a citizen of Zambia.
7(1). Subject to the provisions of clause (2), a person born in Zambia after the commencement of this Constitution whose father is an established resident shall become a citizen of Zambia at the time of his birth.
(2) Any such person shall cease to be a citizen of Zambia upon attaining the age of twenty0two years unless—
(a) he, after attaining the age of twenty-one years, makes application to the Citizenship Board, in such manner as may be prescribed by or under and Act of Parliament, for the confirmation of his citizenship and such application is granted; and
(b) he renounces his citizenship, if any, of a country other than Zambia within three months of his being notified that his application for the confirmation of his citizenship has been granted.
(3) the provisions of clause (2) shall not apply to any person who, under the law of any country other than Zambia, is, on attaining the age of twenty-one years, not a citizen, and is not or was not at any time before that age entitled to be registered as a citizen, of that country.
Download: Zambia Constitution 1973