For the first question I believe is D, and the second question I think is D as well
Answer:
Other factors that contributed to the end of Reconstruction were the Panic of 1873 and political corruption in the United States. In the 1870s, corruption became a noticeable problem at multiple levels of the US government. Corrupt political bosses, such as Boss Tweed, ran American cities.
The european brought with them many things which has changed the lifestyles of american indians living in the great plains.
And all these traders influenced a great deal in altering the life style of the amercians.
The animal, that is introduced by eurpoean traders to changed the lifestyle of american indians is, Horse.
