Under the early Qajars, Tabriz rose from being a provincial backwater in ruins to the foremost commercial entrepôt of Iran. Initially, its insignificant foreign trade was limited to Turkey (mostly raw Gilani silk), but, when the major commercial southern and western supply routes of Iran became unsafe and costly, trade moved to the northern route. Moreover, after Russia opened its territory to European goods in 1821, these also flowed via Tiflis to Tabriz. When ten years later Russia revoked this permission, the Tiflis trade moved to Tabriz via Trabzon, gradually replacing not only the Tiflis route but also the Istanbul-Erzerum route. This turned Trabzon into a quasi-“Iranian” port, as initially most of its imports were destined for or coming from Iran. Four-fifths of imports to Tabriz were European fabrics. Initially these had come from Russia, but, as of the 1820s, such were replaced by British, German, French, and Swiss fabrics. By mid-century, Manchester fabrics dominated the import trade of Tabriz. Thus, Great Britain took Russia's place as its primary trading partner, although by 1900 the tables had turned. During the majority of the nineteenth century, Caucasian Armenian merchants dominated Tabriz's foreign trade, with European merchants playing an important but limited role in the import of Manchester goods and the export of raw silk. After 1870, the importance of Tabriz as the commercial hub of N.W. Iran decreased, due to various reasons such as the outbreak of the Gilan silk disease, Russia stopping the transit of non-Russian goods, and the opening of the Suez Canal, but also because it became cheaper to import goods via Bushehr and Baghdad-Kermanshah. Nevertheless, even with a diminished role as a financial center and less foreign trade, Tabriz continued to be Iran's major commercial center until WW I.