Beginning in 1950, US involvement increased from just assisting French collision forces to providing direct military assistance to the associated states (Annam, Tonkin, Laos, and Cambodia). In May 1961 Kennedy sent 500 more military advisers, bringing American forces there to 1,400.
The solid south was an electoral voting blog of southern us. Im not sure about the answer to the next question I hope I helped
The answer is A. They do this as a way of showing party unity.
It means - a forcible overthrow of a government or social order, in favor of a new system.