What was the result of Vietnam’s civil war in 1975? A. American involvement helped the democratic South defeat the communist North, and a republic was established. B. American involvement helped the communist North defeat the democratic South, and a communist state was established. C. Despite American support of the democratic South, the North won the war and established a communist state. D. A peace treaty was signed, and the nation was partitioned into a communist North and a democratic South. Please select the best answer from the choices provided.