Here is a quote from there:
In 1920 at the Conference of San Remo held at San Remo, Italy, the League of Nations mandate over Palestine was assigned to Britain.

This territory at this time included all of what would later become the State of Israel, the Gaza Strip, the West Bank, a part of the Golan Heights, and the Kingdom of Jordan.

The population of this area was approx. 750,000 (11% Jewish). It was multi-ethnic but spoke mainly Arabic and was largely Muslim in faith.

Because of their European origin most Jews spoke Yiddish rather than Hebrew.

It contained a significant Bedouin population (approx. 270,000), and substantial groups of Druze, Syrians, Sudanese, Circassians, Egyptians, Greeks, and Hejazi Arabs (many of them were of the 1,000,000 refugees who fled west after the Hashemite Hejaz - Saudi Nejd war).