biography bộichâu cai china congresses educators fredericc howe juvenileliterature juvenileliteraturehenrystreetsettlement(newyork juvenileliteraturewald lilliand moton nationalists newyork newyork(state) phan politicalactivists politicsandgovernment publichealth publichealthnurses publichealthnursing revolutionaries robertrussa socialconditions socialreformers unitedstates vietnam vietnamesepoliticalhistorycolonialhistorynationalism19th-20thcenturies wz100w1571983 yuanpei 蔡元培