Sentence:  But it had , as was usual in southern cities of this sort , a Black Bottom , a low region near the river where the Negroes lived - servants and laborers huddled together in a region with no sewage save the river , where streets and <WSD>sidewalks</WSD> were neglected and where there was much poverty and crime . 
Meaning of the word marked with <WSD> tags:  walk consisting of a paved area for pedestrians; usually beside a street or roadway