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: BORDERS 
Clue: Argentina's border with this country is 3,200 miles long, about the same as its coastline
chile

Category: UNCIVIL UNREST 
Clue: "This is the farewell kiss, you dog", said Muntader al-Zaidi as he threw both of these at Pres. Bush in Dec. 2008
his shoes

Category: THE UNITED STATES OF MEXICO 
Clue: From the Arabic Wadi Al-Hijarah, it's Mexico's second-largest city

guadalajara