President Lyndon B. President of Vietnam
John Adams was an ambassador to France during the American Revolution. Also served in Amsterdam securing a large loan that helped finance the war. He was also the first VP under George Washington, though Washington pretty much shut him out.
Answer:
The reason citizens must do this is because they are responsibilities that we must serve to be considered a US citizen.
Explanation:
This was introduced under The Premise's of Americans' Responsibility Under the Constitution of 1787.
East and West Berlin were separated by the "Berlin Wall" during that Cold War that existed between the United States and Soviet Russia, since this was meant to keep people in East Berlin from fleeing to the western half.