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: LAW ENFORCEMENT 
Clue: This police force developed from bands of Indian fighters who protected American settlers in Mexico
the texas rangers

Category: 19th CENTURY AMERICA 
Clue: This politician died on June 3, 1861, 39 days after giving a speech in Springfield, Illinois supporting the Union
stephen douglas

Category: RICH & FAMOUS 
Clue: "Worth" magazine says with 1.7 million ranchland acres in 5 states, this mogul is the USA's largest private landowner

ted turner