Sykes–Picot Agreement

 https://en.wikipedia.org/wiki/Sykes%E2%80%93Picot_Agreement

The agreement is seen by many as a turning point in Western and Arab relations. It negated the UK's promises to Arabs[9] regarding a national Arab homeland in the area of Greater Syria in exchange for supporting the British against the Ottoman Empire. The agreement, along with others, was made public by the Bolsheviks[10] in Moscow on 23 November 1917 and repeated in the British Guardian on 26 November 1917, such that "the British were embarrassed, the Arabs dismayed and the Turks delighted".[11][12][13] The agreement's legacy has led to much resentment in the region, among Arabs in particular but also among Kurds who were denied an independent state.[14][15][16][17]