A few non-fiction recommendations for the history buffs who are fascinated by the frontier and Manifest Destiny periods:
The Last Gunfight (Jeff Guinn); centered around the buildup to the famous shootout at the OK Corral in Tombstone, its main focus is the socioeconomics and character of the frontier.
War Lovers (Evan Thomas); nationalism and political maneuvering by Teddy Roosevelt — and the first mainstream sensational use of the media as a business by Hearst — to become a global power in the buildup to the Spanish-American War.
Flyboys (James Bradley); centers around the cannibalism of Navy pilots shot down over Chichi Jima in WWII, but it also explores the broader history of U.S.-Japan relations that led to such a brutal war in the Pacific, as well as the advancement of naval doctrine to use aircraft carriers — not battleships — to project power.
