What caused concern among arabs living in palestine in 1922

The British authorities conducted their first census in Palestine in 1922. There were 680,000 Arabs and 84,000 Jews. The Jews were just 12% of the Arab population. Those numbers increased due to large migration in the following decades. The GDP of the Jewish economy in 1922 was just 25% of that of the Arab GDP, but the Jewish standard of living measured in GDP per capita  was twice that of the Arab. In that year, too, Jewish immigration was limited by the British, but the measure would be soon reversed.

Explanation:

the roman army grew in size and became dominant in the mediterranean region.