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.
--------
Question: Category: THE 19th CENTURY 
Clue: In 1825 patriots crossed the Rio de la Plata from Argentina to fight for this country's freedom from Brazil

Answer: uruguay


Question: Category: CLOTHING 
Clue: They can be crew, knee, or bobby

Answer: socks


Question: Category: HISTORY CLASS 
Clue: Founded in 1702, Mobile in this state became the "City of Six Flags" (but it doesn't have a Six Flags theme park)

Answer:
alabama