What did the tet offensive prove about the Vietnam war

The Tet Offensive played an important role in weakening U.S. public support for the war in Vietnam. (some name I can't type because wont allow me to publish this answer with it) and leaders in Hanoi planned the Tet Offensive in the hopes of achieving a decisive victory that would end the grinding conflict that frustrated military leaders on both sides.

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imma have to go   the third option

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