1868-1963 1898-1976 1902-1967 20thcentury africanamericans american asianamericanstudies biography dubois erika estonians ethnicstudies finland his037000soc043000 history hughes intellectuallife langston leyda liangmo liu nivanka paul politicalactivity politicsandgovernment relationswithchinese robeson si-lanchen socialscience womenintellectuals world