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Which statement best describes the U.S. involvement in Vietnam?
• President Jimmy Carter invited Sadat and Begin to a meeting at the presidential retreat of Camp David in Maryland.
• Eisenhower sent American military advisors to South Vietnam to train the regime's army.
• John F. Kennedy met with Nikita Khrushchev in Vienna, Austria to discuss whether communism was destined to overcome capitalism.
• Vice President Lyndon Johnson made a visit to South Vietnam in 1961.