1871 1886 1912 1920-1921 1922-1923 19thcentury 812 chicago coalstrike disasters greatfire haymarketsquareriot history illinois korea laborlawsandlegislation laborunions lawrence microfilm20 peasantuprisings pullmanstrike socialconditions somersetcounty sources strikesandlockouts textileworkers'strike tonghakincident unitedstates