Mostly the reasons were economic. The country's economy was dismembered when it entered the great depression and they had to take care of that. The South used this to reinforce its values because nobody was bothering them since the great depression forced the government to move its focus on something else.
One of the main reasons why Bismarck wanted to control the territories of Alsace and Lorraine was mostly because both territories were plentiful and useful territories to have in any country as they were quite developed. It was also good for strategic reasons.
Option C. Columbus underwent deep voyages and discovered the present day America. He also discovered the marine route which associated the old Eastern world to the new Western world.
After the establishment of Sea route there was exchange of goods with other countries started. But the negative impact was that people of Eurasia were not healthy with high levels of immunity.
The interchange of food supplies also initiated the arrival of dangerous diseases too and major part of the European, native American and Asian population died causing shortage of human labor, this gradually lead to the slavery of Africans.
