Which mandate shown in the source would be the most problematic for the british in the mid 20th century?

 The British Mandate over PALESTINE

Explanation/context:

The mandate system authorized a member nation of the League of Nations to govern a former German or Turkish colonial area after the conclusion of World War I.  

There were mandate territories for former German territories in Africa and Asia, as well for former Ottoman territories in the Middle East.  

The former Turkish provinces of Syria, Iraq and Palestine in the Middle East were divided into a French mandate territory and British mandate territory. The British mandate rule over Palestine proved very problematic for the British to govern, as tension grew between local Arab populations and a strong influx of Jewish immigrants trying to reestablish themselves in the region.  The British Mandate period in Palestine has much to do with the history of the development of the Arab-Israeli conflict.

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).

study of past cultures