What indicated that the United States had been secretly involved in Vietnam before it’s official involvement

Explanation:

The Pentagon Papers is a collection of secret US government documents about the Vietnam war.

The documents, which cover the time from 1945 until the 1967, were declassified in 1971.

According to information in the Pentagon Papers, the US involvement in the Vietnam war began in 1950.

The French government was fighting a war in Vietnam. But the war was not going well for France. Until 1950, the US had refused to help the French efforts in Vietnam.

answer; i believe that the correct answer is (chronological order);

mustafa ataturk thought nationalism in turkey would best be achieved by modernizing the country.