Which vietnam policy came first in the johnson administration?

a. gulf of tonkin resolution
b. tet offensive
c. operation rolling thunder
d. vietnamization

The ACTUAL correct answer is:  A. Gulf of Tonkin Resolution

Dates of the items listed:

Further detail on Gulf of Tonkin Resolution:

The Gulf of Tonkin Resolution, passed by Congress in August, 1964, after alleged attacks on two US naval ships in the Gulf of Tonkin.  The key wording in the resolution said:

That resolution served as a blank check for President Johnson to send troops to whatever extent he deemed necessary in pursuance of the war.  Between 1964 and the end of Johnson's presidency in 1969, US troop levels in Vietnam increased from around 20,000 to over 500,000.

for the united states of america, 1945 to 1964 was a time of high economic growth and general prosperity. it was also a time of confrontation as the capitalist united states and its allies politically opposed the soviet union and other communist countries; the cold war had begun.

explanation:

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