Genocide is a term being used as to describe the violence against a group in order to destroy another group. In 1948, it was declared by the United Nations to be an international crime.In the 20th century, the 2 areas of the world having the most acts of genocide is Latin America and Africa.
"<span>Military power shifted away from European nations" is the best option since it was this very military power that allowed the European nations to be so dominating.</span>
Personally, I see it as a mixture of both a and b but my first instinct was to go with b.
