When was Washington built

july 16 1790

Explanation:

Founded on July 16, 1790, Washington, DC is unique among American cities because it was established by the Constitution of the United States to serve as the nation's capital.

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.