1TheUnitedStatesistheworldsoldestsurvivingfederationItisaconstitutionalrepublic宪政共和国Federal联邦andstatejudicial司法的andcabinetofficialsaretypicallynominated提名bytheexecutivebranch行政部门andapprovedbythelegislature立法机关althoughsomestatejudgesandofficialsareelectedbypopularvote普选IntheAmericanfederalistsystemcitizensareusuallysubjecttothreelevelsofgovernmentfederalstateandlocalThegovernmentisregulatedbyasystemofchecksandbalances相互监督与制衡definedbytheUSConstitutionwhichservesasthecountryssupreme最高的legaldocument2RacialdiscriminationorthecolorproblemrefersmainlytoNegroesintheUnitedStatesastheyconstituteonetenthofthetotalpopulationThetermNegroisappliedtopeopledescendedorpartlydescendedfromslavestransportedfromAfricalongagotheNegropositiontodaycouldntbeunderstoodTheblackpopulationisabout20millionTheirancestorswerebroughttoAmericaasslavesintheseventeenthandeighteenthcenturiesNearlyalltheirdescendantswerekeptinlegalslaveryintheSouthuntil1865ThesouthernstatesweredefeatedintheCivilWarandwereforcedtoabolishslaveryandsettheslavesfreeButthesouthernersweredeterminedtokeeptheNegroesfrombecomingequalinanythingbutconstitutionallawTheFederalGovernmenthasgraduallycompelledthewhitemajorityintheSouthtoallowNegroestoenjoycivicrightsButlegalprotectionhasbeenslowtodevelopandhasnotyetsolvedthesocialproblemofinequalityinvotingeducationemploymentandhousing