It was President Lyndon B. Johnson who increased involvement in Vietnam after the Gulf of Tonkin. The Gulf of Tonkin Resolution was signed into law in 1964.
Gulf of Tonkin
The residents Johnson said that an American ship was bombed in the Gulf of Tonkin - that was a lie. However, that lie helped him to send U.S. troops to Vietnam.
Under the Nixon administration.
The gulf of tonkin resolution was passed by President Johnson, in 1964, in responce to the attacks launched by the north vietnamese, against the American ships in the gulf of tonkin.
Lyndon B. Johnson
The date of the Tonkin Gulf Resolution was August 7th, 1964.
To expand the U.S. military presence in Vietnam
The Gulf of Tonkin Resolution increased the president's ability to wage war without congressional approval.
August 7, 1964 .
Congress passed this resolution which gave President Johnson whatever measures were necessary to prevent harm to US ships.
The "resolution" authorized the President to use whatever force he wished to protect US interests.