Final answer:
The papers written by Daniel Ellsberg are called the Pentagon Papers and they lessened US support for the Vietnam War.
Step-by-step explanation:
The papers written by Daniel Ellsberg and named after the famous building in Washington D.C. that lessened US support for the Vietnam War are called the Pentagon Papers.
These papers were compiled at the request of Secretary of Defense Robert McNamara and provided a study of U.S. political and military involvement in Vietnam from 1945 to 1967.
Daniel Ellsberg famously released passages of the Papers to the press, revealing that the United States had secretly enlarged the scope of the war by bombing Cambodia and Laos while lying to the American public about it.