Final answer:
James Fenimore Cooper is the author known for writing about Native Americans and the frontier west, particularly highlighted in his novel 'The Last of the Mohicans'.
Step-by-step explanation:
The author known for writing about Native Americans and the frontier west is James Fenimore Cooper. He notably created a popular historical novel The Last of the Mohicans, which was part of his Leatherstocking series. The book paints a romantic version of the French and Indian War with its main protagonist, 'Natty' Bumppo or Hawkeye, born to White parents, living among Native Americans.
While other authors, including Mark Twain, also wrote about frontier life, none have the specific focus on Native American life and the frontier west that James Fenimore Cooper is known for. Therefore, out of all the given options, Cooper most fits the criteria of an author known for writing about Native Americans and the frontier west.
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