This agreement between the Allies after the First World War (Britain, France, Italy, Japan) was adopted on 25 April 1920 at the San Remo conference. The mandate for Palestine was based on this resolution; it took up the Balfour Declaration of 1917 and Article 22 of the League Federation. Britain was tasked with establishing a “national homeland for the Jewish people” in Palestine. Terrorist borders were not decided until four years later. The decisions of the San Remo conference confirmed the award of the mandates of the London conference. The San Remo resolution, adopted on April 25, 1920, contained the Balfour Declaration of 1917. You and Article 22 of the League of Nations were the basic documents on which the British mandate for Palestine was built. As part of the Balfour Declaration, the British government pledged to advocate the creation of a national homeland for the Jewish people in Palestine, without prejudice to the civil and religious rights of non-Jewish communities in Palestine or the rights and political status enjoyed by Jews in any other country.  Article 22, paragraph 4, of the pact referred to certain categories of the population as “communities that once belonged to the Turkish Empire” as a “development phase in which their existence can be temporarily recognized as an independent nation” (the mandate League_of_Nations_mandate-Types_of_mandates Class A) and charged the obligation to “provide administrative advice and support to these territories until they are able to remain alone” Britain has received The mandate of Palestine and Iraq; France has taken control of Syria, including present-day Lebanon. Under the 1918 Clemenceau-Lloyd George Agreement, Britain and France also signed the San Remo Oil Agreement, in which Britain granted France a 25% share of Mosul`s oil production, the rest having gone to Britain and France pledged to deliver oil to the Mediterranean. The draft peace agreement with Turkey, signed at the conference, became the basis of the 1920 Treaty of Sevres. Germany was asked to respect its military and reparation obligations under the Treaty of Versaille and a resolution was adopted to restore trade with Russia.  Conference of San Remo (19-26 April 1920), an international meeting convened in San Remo, on the Italian Riviera, to decide the future of the former territories of the Turkish Ottoman Empire, one of the central powers defeated during the First World War; The conference brought together the Prime Ministers of Great Britain, France and Italy, as well as representatives from Japan, Greece and Belgium.
The conference, which was attended by Great Britain, France, Italy and Japan, with the United States as neutral observers, was held in San Remo, Italy, in April 1920. As the map shows, the original mandate was for the whole of Palestine; In 1921, Winston Churchill separated about 78 percent from Palestine to found the emirate of Transjordan, where British ally Abd Allah ibn al-Husayn was installed as king. Julie Murray said: “The separation between British and French territory was clarified in the Franco-British Convention on certain points concerning the mandates for Syria and Lebanon, Palestine and Mesopotamia, signed in December 1920, which does not mention Transjordan, as it is part of the British mandate of Palestine.” At the San Remo conference (April 24-25), an Anglo-French oil agreement was also concluded, which provided France with a 25% share of Iraqi oil and favourable conditions for the transport of oil, in exchange establishing the inclusion of Von Mosul in the British mandate of Iraq. The San Remo Conference was an international meeting of the Supreme Council of Allies after World War I as a descendant of the Paris Peace Conference held April 19-26, 1920 at Villa Devachan in Sanremo, Italy.