Answer:
The intervention by some civilized nation can be caused by war and famine. Loss of property and other things can be caused through this and can cause intervention by some civilized nation.
Explanation:
The transcontinental railroad let the settlers go to the western side of America. With that they needed more farms for food and resources to provide a profit. The settlers did not want to do the work to they forced slaves to work for them. The settlers in the west made slavery increase due to the wanted of profit and the needing to survive.
D because it provides a good source for whales, seals, ice fish, and penguins. Those adaptations allow them to survive the winter months.
