Use the timeline to answer the question.
1870: First Black
Senator, Hiram Rhodes
Revels, Elected
1869
1870
O
1871
1872: P.B.S. Pinchback
Becomes the First Black
Governor
1872
1871: Five Black
Members Elected
to Serve in the House
What brought an end to the trend illustrated in the timeline?
the growing power of the Republican Party in southern politics
the population shift that resulted from the Great Migration
the withdrawal of federal troops from southern states
the impeachment of President Andrew Johnson by Congress