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.

Category: U.S. MILITARY HISTORY
Clue: This general commanded the first official American force to fight on the European continent
john pershing

Category: AFRICAN CAPITALS
Clue: To get the name of its country, add 2 letters to the end of this world capital city
tunis

Category: WWII
Clue: In English, it's the word that Mussolini was the first to use to describe the partnership between Berlin & Rome
axis