Khuzestan Province
The seat of the province has for the most of its history been in the northern reaches of the land, first at Susa (Shush) and then at Shushtar. During a short spell in the Sasanian era, the capital of the province was moved to its geographical center, where the river town of Hormuz-Ardasher, founded over the foundation of the ancient Hoorpahir by Ardashir I, the founder of the Sasanian Dynasty in the 3rd century CE. This town is now known as Ahvaz. However, later in the Sasanian time and throughout the Islamic era, the provincial seat returned and stayed at Shushtar, until the late Qajar period. With the increase in the international sea commerce arriving on the shores of Khuzistan, Ahvaz became a more suitable location for the provincial capital. The River Karun is navigable all the way to Ahvaz (above which, it flows through rapids). The town was thus refurbished by the order of the Qajar king, Naser al-Din Shah and renamed after him, Nâseri. Shushtar quickly declined, while Ahvaz/Nâseri prospered to the present day.
Ahvaz
Oil was found near Ahvaz in the early 20th century, and the city once again grew and prospered as a result of this newfound wealth. From 1897-1925, the city of Ahvaz was in the hands of heshmatoddoleh Ghajar, whom acted as governor and Sarhang Reza Gholi Khane Arghoon as commander of Ghajari's army based in Khuzestan. Khaz'al Khan/Sheikh Khaz'al was appointed by Mozaffareddin shah / Mozaffar ad-Din Shah Qajar in Khorramshahr, Sardar Asad Bakhtiari as the most powerful leader of Khuzestan's Bakhtiaries. He had power and authority over most regions of Khuzestan, such as Dezful, Shushtar, Izeh, even Ahvaz and Amir mojahede bakhtiari in Ramhormoz and Behbahan. At this time, the newly founded Ahvaz was named "Nâseri" in honour to its founder Nassereddin Shah Qajar. Afterwards, during the Pahlavi period, it resumed its old name, "Ahvaz". The government of the Khūzestān Province was transferred there from Shûshtar in 1926. The Trans-Iranian Railway reached Ahvaz in 1929 and by World War II, Ahvaz had become the principal built-up area of the interior of Khūzestān. Professional segregation remained well marked between various groups in that period still feebly integrated: Persians, sub-groupings of Persians and Arabs. Natives of the Isfahan region held an important place in retail trade, owners of cafes and hotels and as craftsmen.