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[[File: Hachshara.jpg|300px|thumb|left|Jewish settlers in Palestine in the 1920s]]

The declaration was opposed by Arab public opinion but after the war, but it was endorsed by the victorious allies and it became official British policy. It was also supported by the Americans, but they had some reservations. Many in the British government believed that the Balfour Declaration was a mistake and that it would only lead to instability and conflict and that it had no basis in international law and argued that they had betrayed their Arab allies who had participated in the Great Arab Revolt (1916-1918). However, the Balfour Declaration remained, and it was official British policy until the start of WWII. This was despite increasingly violent Arab opposition.

The Balfour Declaration and the failure of the western powers to grant a Pan-Arab state led to a great deal of resentment in the Middle East. The British not only had failed to help the Arabs to found a state but had effectively colonized them and had even given traditionally Muslim territory to non-Muslims. What particularly angered the Arabs was that Jerusalem one of the holiest sites in Islam and could be lost to Jews. This led to a deep suspicion of Britain and the west in general, in the Arab World. During WWI the Arabs had seen the British as liberators who would help to modernize their society and free them from Ottoman oppression. The Balfour Declaration was to shatter this view and led to a great deal of bitterness. The Muslim world, in particular, came to believe that it could not trust the British and the west. The anti-western sentiments that were provoked by the Balfour Declaration remain to this day. The Declaration of 1917 poisoned the relationship between the Arab World and the West. It persuaded many that the western powers would always favor the Jews at the expense of the Muslims in the Middle East.