In 1947 the Truman (president of the USA) made a public promise to come to the aid (financially and militaristically) of any country 'threatened' by communism
In retaliation to china's support of the Viet Minh, the USA offered the French support. By 1954 they hadsent $3 billion to the French and 80% of their equipment
1. USA funded and supplied ARVN to resist the NLF ($1.6 billion in cost)
2. US sent military advisors to support ARVN
3. NFL were popular as they planned to overthrow Diem and create a new government that represented all social classes. They attacked and murdered government workers