How did the Hundred Years War contribute to the end of Europe's medieval
period?

four sitting presidents have been assassinated while in office but the first was abraham lincoln,

d. the great plains       hop3 this yo

answer is b.

  it is always the best policy to have good communication and good relations between individuals and, specially, between leaders of the countries. for this purpose, among others, there is a common place, the united nations, where the representants can present his and learn about the other country's policies.