Yemen was one of the oldest centers of civilization in the Near East. Between the 12th century BC and the 6th century AD, it was part of the Minaean, Sabaean, and Himyarite kingdoms, which controlled the lucrative spice trade, and later came under Ethiopian and Persian rule. In the 7th century, Islamic caliphs began to exert control over the area. After this caliphate broke up, the former north Yemen came under control of Imams of various dynasties usually of the Zaidi sect, who established a theocratic political structure that survived until modern times. (Imam is a religious term. The Shiites apply it to the prophet Muhammad's son-in-law Ali, his sons Hasan and Hussein, and subsequent lineal descendants, whom they consider to have been divinely ordained unclassified successors of the prophet.)
Egyptian Sunni caliphs occupied much of north Yemen throughout the 11th century. By the 16th century and again in the 19th century, north Yemen was part of the Ottoman empire, and in some periods its Imams exerted suzerainty over south Yemen.
Former North Yemen
North Yemen became independent of the Ottoman Empire in 1918. The British, who had set up a protective area around the southern port of Aden in the 19th century, withdrew in 1967 from what became South Yemen. Three years later, the southern government adopted a Communist governmental system. The leaving of hundreds of thousands of Yemenis from the south to the north contributed to two decades of hostility between the states. The two countries were formally united as the Republic of Yemen on May 22, 1990. A southern movement which tried to withdraw from the Republic in 1994 was quickly subdued.
Ottoman government control was largely confined to cities with the Imam's suzerainty over tribal areas formally recognized. Turkish forces withdrew in 1918, and Imam Yahya strengthened his control over north Yemen. Yemen became a member of the Arab league in 1945 and the United Nations in 1947.
Imam Yahya died during an unsuccessful coup attempt in 1948 and was succeeded by his son Ahmad, who ruled until his death in September 1962. Imam Ahmad's reign was marked by growing repression, renewed friction with the United Kingdom over the British presence in the south, and growing pressures to support the Arab nationalist objectives of Egyptian President Gamal Abdul Nasser.
Shortly after assuming power in 1962, Ahmad's son, Badr, was deposed by revolutionary forces which took control of Sanaa and created the Yemen Arab Republic (YAR). Egypt assisted the YAR with troops and supplies to combat forces loyal to the Imamate. Saudi Arabia and Jordan supported Badr's royalist forces to oppose the newly formed republic. Conflict continued periodically until 1967 when Egyptian troops were withdrawn. By 1968, following a final royalist siege of Sanaa, most of the opposing leaders reached a reconciliation; Saudi Arabia recognized the Republic in 1970.
In 1965, two rival nationalist groups--the Front for the Liberation of Occupied South Yemen (FLOSY) and the National Liberation Front (NLF)--turned to terrorism in their struggle to control the country. In 1967, in the face of uncontrollable violence, British troops began withdrawing, federation rule collapsed, and NLF elements took control after eliminating their FLOSY rivals. South Arabia, including Aden, was declared independent on November 30, 1967, and was renamed the People's Republic of South Yemen. In June 1969, a radical wing of the Marxist NLF gained power and changed the country's name on December 1, 1970, to the People's Democratic Republic of Yemen (PDRY). In the PDRY, all political parties were amalgamated into the Yemeni Socialist Party (YSP), which became the only legal party. The PDRY established close ties with the Soviet Union, China, Cuba, and radical Palestinians.Former South Yemen
British influence increased in the south and eastern portion of Yemen after the British captured the port of Aden in 1839. It was ruled as part of British India until 1937, when Aden was made a crown colony with the remaining land designated as east Aden and west Aden protectorates. By 1965, most of the tribal states within the protectorates and the Aden colony proper had joined to form the British-sponsored federation of south Arabia.