The answer for your question is the Civil War A)
Your answer is A, Alaska
The Senate approved the treaty of purchase on April 9; President Andrew Johnson signed the treaty on May 28, and Alaska was formally transferred to the United States on October 18, 1867. This purchase ended Russia’s presence in North America and ensured U.S. access to the Pacific northern rim.
Sure hope this helps!
It's mainly because of A and B, because after the war, the industrial resolution happened, and farmers are replaced by machines, farmers has no work to do, their speed is no compare to the machines, so they must move to another place. Also the population in Europe is growing in a extremely fast speed. Hope that helps :)
Answer:
Du Bois agreed that self-improvement was a good idea, but that it should not happen.