the franco-british boundary agreement of 1920 described an imprecisely defined boundary between lebanon and palestine. it appeared to pass close to the north of al-bassa, leaving the village on the palestinian side but cut off from much of its lands. however the french government included al-bassa in a lebanese census of 1921 and granted citizenship to its residents. meanwhile, a joint british-french boundary commission was working to determine a precise border, making many adjustments in the process. by february 1922 it had determined a border that confirmed al-bassa as being in palestine. this became official in 1923. the citizenship of the residents was changed to palestinian in 1926.