The Balfour Declaration, it is true, was only British policy, not law. However it became law following agreement of the WWI Allies at San Remo in 1920. It was further confirmed as International Law by the issuance of the British Mandate for Palestine in 1922, and the the agreement to that by the United States of America in a joint resolution of Congress in 1922. "The Mandate was in effect a trust agreement with the UK selected as the Mandatory Power. Exclusive political rights to Palestine was granted to the Jews in a trust to be administered by the UK. That method was used, according to Arnold Toynbee and Lewis Namier of the British Foreign Office because the Jews were a minority in Palestine at the time even though they had been a majority in Jerusalem since 1863. Toynbee and Namier recognized that giving sovereignty to the Jews when they were a small minority of the population, 10 percent in 1917, would be antidemocratic. To avoid opposition based on that argument, they conceived of giveing the Jews these political rights in trust until such time as the Diaspora Jews had an opportunity to return to Palestine and to create a Jewish population majority. When that occurred, and when the Jews had satisfied the other requirements of exercising sovereignty, such as unified control and definite borders, the could then reconstitute the National Home as a Jewish State. Progressive US President Woodrow Wilson opposed the Balfour Declaration as inconsistent with point XII of the famous 14 points. During his Administration, over his objection, it was approved by the US Congress in a joint resolution. In 1924 under the next Administration, it was incorporated into a Treaty between the US and the UK and became the domestic law of those states as well. The Ottoman Empire, in Article 95 of the Treaty of Sevres, ceded their sovereignty over Palestine to the Mandatory Power. This was confirmed in the Treaty of Lausanne that left those parts of the Treaty of Sevres in place in those parts dealing with the Middle East and North Africa.