Answer:
Look below
Step-by-step explanation:
First question: The United States was afraid that communism would spread to South Vietnam and then the rest of Asia.
Second question: Johnson launched a bombing campaign in the North, and in March 1965, dispatched 3,500 marines to South Vietnam.
Third question: The rise of the Cold War politics, civil right movements, student protests, and the Vietnam War.
The fourth question is what YOU think why these changes developed at this particular time not me. You got this!