Independence: 1 April 1979 (Islamic Republic of Iran proclaimed); notable earlier dates: ca. 550 B.C. (Achaemenid (Persian) Empire established); A.D. 1501 (Iran reunified under the Safavid Dynasty); 1794 (beginning of Qajar Dynasty); 12 December 1925 (modern Iran established under the PAHLAVI Dynasty)
Definition: For most countries, this entry gives the date that sovereignty was achieved and from which nation, empire, or trusteeship. For the other countries, the date given may not represent "independence" in the strict sense, but rather some significant nationhood event such as the traditional founding date or the date of unification, federation, confederation, establishment, fundamental change in the form of government, or state succession. Dependent areas include the notation "none" followed by the nature of their dependency status. Also see the Terminology note.
Source: CIA World Factbook - This page was last updated on July 9, 2017