https://www.jpost.com/israel-news/100-years-since-san-remo-when-israel-became-a-sovereignty-626497
In San Remo, the League of Nations decided to turn much of the former Ottoman Empire into new nation-states: Syria, Iraq, Lebanon and Jordan all emerged from this process, along with Israel.
The 1920 international conference in San Remo, Italy, is finally getting some of the attention it deserves. That conference created Mandatory Palestine as a “national home” for the Jewish people, and promised Jewish migration and “settlement” throughout Palestine, including Judea and Samaria. Yet in the collective memory, the United Nations General Assembly vote in November 1947 to partition Palestine – essentially repudiating much of San Remo – is more closely linked with the establishment of the state.
It is important for Israel to use this centenary occasion to upgrade the memory of San Remo and its importance – putting it ahead of the UN vote that was at best meaningless.
In San Remo, the League of Nations decided to turn much of the former Ottoman Empire into new nation-states: Syria, Iraq, Lebanon and Jordan all emerged from this process, along with Israel. None of these previously existed as states, but today their legitimacy is unquestioned because they arose from the mandate process. More importantly, all the states that arose from mandates inherited the Mandatory borders: so San Remo explains why Israel’s borders include Judea and Samaria.