Which race had the highest unemployment in the US in 1955,Caucasians or African Americans?
return Caucasians ;return African Americans ;return unemployment of #1 ;return unemployment of #2 ;return #3 in  1955 ;return #4 in  1955 ;return which is the  highest of #5 ,  #6
['select', 'select', 'project', 'project', 'filter', 'filter', 'comparison']