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: INDIANA 
Clue: Indiana's state motto is "The Crossroads of" this
america

Category: BIRDS 
Clue: The "snowy" type of this member of the heron family is known for its beautiful white plumes
an egret

Category: U.S. RIVERS 
Clue: The Falls of Saint Anthony stop this mighty river from being navigable north of St. Paul, Minnesota

the mississippi