Question

after world war ii, the united states became increasingly involved in vietnam to stop the spread of communism. the u.s. supported the south vietnamese government against the communist north, which was backed by the soviet union and china. this policy, known as containment, was part of the larger cold war strategy. american leaders believed that if one country fell to communism, others in the region might follow—an idea called the \domino theory.\ early u.s. involvement included sending military advisors and financial aid. over time, however, this support grew into a full-scale military conflict. the u.s. government saw vietnam not just as a local issue, but as a critical front in the global fight against communism.
what is the main idea of the passage?
a. the u.s. feared losing access to asian markets after world war ii.
b. the vietnam war was caused by disagreements between north and south vietnam.
c. the u.s. became involved in vietnam to stop the spread of communism.
d. china and the soviet union planned to invade the u.s. through vietnam.

Explanation:

The passage states that after WWII, the US got involved in Vietnam to stop communism's spread, as part of containment policy and due to the domino theory. Option A is incorrect as the passage doesn't mention Asian markets. Option B is wrong as the cause of the Vietnam War here is about communism, not North - South disagreements. Option D is false as there's no mention of China and the Soviet Union planning to invade the US via Vietnam. Option C matches the main idea of US involvement to stop communism.

Answer:

C. The U.S. became involved in Vietnam to stop the spread of communism.