Explanation:
C. Large mammals such as mammoths began to die out.
There is a saying that goes like this: Absolute power corrupts. Power causes conflict because it gives one the feeling they are better then everyone else. Many times, a person with power has little respect for others, making it hard to work with them.
Some long-term effects that occurred after the Civil War were the abolishment of slavery, the formation of blacks’ rights, industrialization and new innovations.
Hope this helps