The cause of America participating in the Vietnam War is the fear of American communism. The essence of this message is the President 's speech to American citizens. Obviously, Source A is the main source of information since Source A was spoken by President Lyndon B Johnson in April 1965. This indicates that the source is the primary source. It is quite possibly that the US president's adviser made this information source for President Lyndon Johnson to speak in front of the American public.
There are many consequences of the US's opposition to the Vietnam War, which may eventually lead to the participation of the United States. Controversial historian Howard Sinen pointed out that during his war, in his book 'American History', during the war, he developed the greatest anti-war movement America had experienced. The role of the end of the war "The first influence of the opposition leading to the end of the war is that the military can get few soldiers, the draft was protested and the ROTC project protested
The US opposition to the Vietnam War began when the US military continued to escalate in the Vietnam War in 1964 and then evolved into a broad social movement in the next few years. This movement provided information on how to end the war from the late 1960s to the early 1970s and helped form a heavily biased debate primarily in the United States. Many people in the American peace movement are students, mothers, or anti-established hippies. The civil rights of African-American, the liberation of women, the Chicano movement, and the involvement of an organized labor sector strengthened the opposition. Many other groups are also participating, including educators, clergy, scholars, journalists, lawyers, doctors (such as Benjamin Spock), and veterans. Their actions mainly include peace and nonviolence, and there are few deliberate provocative and violent cases.