Final answer:
The Vietnam War led to the reunification of Vietnam under a Communist government, a decrease in US public support for containing Communism, and increased anti-government sentiment. However, the war did not halt the spread of communism in Asia.
Step-by-step explanation:
The Vietnam War resulted in several significant outcomes, but in the options provided, the correct answer is that Vietnam was united under a Communist government. After the withdrawal of American troops and the fall of Saigon in 1975, North and South Vietnam were reunified as the Socialist Republic of Vietnam under Communist control. Additionally, the war had profound impacts on US society and foreign policy, including a decrease in public support for the containment of Communism and the spread of anti-government feelings within the United States. The notion that the war halted the spread of communism in Asia does not accurately reflect the historical outcomes, as the war's end result was the establishment of a communist government in Vietnam.