The demographics of northern Syria saw a huge shift in the early part of the 20th century when the Ottoman Empire (Turks) conducted ethnic cleansing of its Armenian and Assyrian Christian populations and some Kurdish tribes joined in the atrocities committed against them. Many Assyrians fled to Syria during the genocide and settled mainly in the Jazira area. During WWI and subsequent years, thousands of Assyrians fled their homes in Anatolia after massacres. After that, massive waves of Kurds fled their homes in Turkey due to conflict with Kemalist authorities and settled in Syria, where they were granted citizenship by the French Mandate authorities. The number of Kurds settled in the Jazira province during the 1920's was estimated at 20,000 people. Starting in 1926, the region witnessed another huge immigration wave of Kurds following the failure of the Sheikh Said rebellion against the Turkish authorities. Tens of thousands of Kurds fled their homes in Turkey and settled in Syria, and as usual, were granted citizenship by the French mandate authorities. This large influx of Kurds moved to Syria’s Jazira province. It is estimated that 25,000 Kurds fled at this time to Syria. The French official reports show the existence of at most 45 Kurdish villages in Jazira prior to 1927. A new wave of refugees arrived in 1929. The mandatory authorities continued to encourage Kurdish immigration into Syria, and by 1939, the villages numbered between 700 and 800. French authorities were not opposed to the streams of Assyrians, Armenians or Kurds who, for various reasons, had left their homes and had found refuge in Syria. The French authorities themselves generally organized the settlement of the refugees. One of the most important of these plans was carried out in Upper Jazira in northeastern Syria where the French built new towns and villages (such as Qamishli) were built with the intention of housing the refugees considered to be “friendly”. This has encouraged the non-Turkish minorities that were under Turkish pressure to leave their ancestral homes and property, they could find refuge and rebuild their lives in relative safety in neighboring Syria. Consequently, the border areas in al-Hasakah Governorate started to have a Kurdish majority, while Arabs remained the majority in river plains and elsewhere.