Was the united states justified in entering the vietnam war?

The United States entered the Vietnam War gradually over a number of years. They essentially took the place of the French who controlled IndoChina after their defeat in 1954. The US began to send military advisors to the region in the 1950s and 1960s. Formal troop commitment began in the mid-1960s.

Yes, they were justified because they had to prevent communism from spreading, which was the pledge of the Truman Doctrine

i also think he is correct. i believe they came to washington to protest their rights.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain