What event led to full-scale involvement of the US in the Vietnam conflict?

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Explanation:

2-4, 1964: Two supposed incidents in the Gulf of Tonkin lead Johnson to seek congressional approval for direct U.S. involvement in Vietnam. March 8, 1965: First Marines land in Danang. Nov. 14-18, 1965: In the Ia Drang Valley, American troops fight their first large scale battles against the North Vietnamese Army.

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.

assessment is the missing word