What was the significance of the Pentagon Papers? Americans’ support for the Vietnam War increased.
The leaked documents hastened the end of the Vietnam War.
Public access to government documents was made more readily available.
New legislation was enacted to outlaw leaking information.

Explanation:

The 47-volume history, consisting of approximately 3,000 pages of narrative and 4,000 pages of appended documents, took 18 months to complete. Ellsberg, who worked on the project, had been an ardent early supporter of the U.S. role in Indochina but, by the project’s end, had become seriously opposed to U.S. involvement. He felt compelled to reveal the nature of U.S. participation and leaked major portions of the papers to the press.

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