The category of 'Palestinian Arab Christian' came to assume a political dimension in the 19th century as international interest grew and foreign institutions were developed there. The urban elite began to undertake the construction of a modern multi-religious Arab civil society. When the British received from the League of Nations a mandate to administer Palestine after World War I, many British dignitaries in London were surprised to discover so many Christian leaders in the Palestinian Arab political movements. The British authorities in the Mandate of Palestine had difficulty understanding the commitment of the Palestinian Christians to Palestinian nationalism.