In 1919 Harry Sacher wrote "A Jewish Palestine the Jewish case for a British trusteeship. In 1920 at San Remo the Allied Principal war powers selected this method. The Palestine Mandate is the trust agreement. Evidence of the intention of the settlors of the trust shows it was their intent to permit the Jews to settle immediately but not to rule until the defined territory contained a Jewish population majority and the capability to exercise sovereignty. Such evidence is the lodestar of the interpretation of the trust. Legal dominion in the collective political rights to self-determination vested in the Jewish People, the trust beneficiary, partly in 1948 and partly in 1967.