TASK DEFINITION: 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.
PROBLEM: Category: "FIRST" PHRASES 
Clue: The earliest known use of this term was in an Indianapolis Star opinion piece of September 20, 1914

SOLUTION: first world war

PROBLEM: Category: AROUND THE WORLD 
Clue: Besides Great Britain, the 2 European countries through which the Greenwich Meridian passes

SOLUTION: france & spain

PROBLEM: Category: INVENTIONS 
Clue: Introduced at the 1900 World's Fair in Paris, its name comes from Latin for "one that takes you up the ladder"

SOLUTION:
escalator