What was the underlying reason for the impeachment of President Andrew Johnson?

a) the credit mobilier scandal
b) a power struggle with congress over reconstruction and the tenure in office act
c) jus refusal to appoint new justices to the supreme court
d) his policies toward native american indians

Which of the following is not true of the xiongnu empire? burial mounds included glass beads and mirrors made from the sands throughout the region. there was more cooperation through trade between the tribes. other tribal units that were eventually assimilated were indo aryan, xianbei, hunyu, scythina and han chinese. as each nomadic tribe and civilization was conquered or absorbed into the larger empire, the xiongnu were able to hold more territory.