You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
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Question: Category: SPORTS CHAMPIONS 
Clue: Winning in 1965 & 1966, he was the first man to win the Masters golf tournament in 2 consecutive years

Answer: jack nicklaus


Question: Category: THE EARLY 1900s 
Clue: These 2 nations fought a war on neither nation's soil; the decisive battle came at present-day Shen-Yang

Answer: russia & japan


Question: Category: SOUTH AMERICA 
Clue: Alphabetically, they're the first & last of the 7 countries where the Andes are found

Answer:
argentina & venezuela