thE golD rush oF 1848 in thE usA______.
A．justiFiED thE purChAsE oF AlAskA
B．EnsurED thE ConvErsion oF pApEr monEy to golD
C．Brought 100 ,000 sEttlErs to A nEw tErritory
D．mADE millionAirEs oF AnDrEw CArnEgiE AnD john roCkEFEllEr