During the Old West era railroads helped connect the entire country, some of the biggest cities in America were built, and America set its sights on becoming a coast-to-coast nation.
But the most famous figures of the era are still the gunslingers, the guys (and a few gals) who liked to settle their disputes with six guns rather than stern words.
Gunslingers such as Jesse James, Billy the Kid, and "Wild Bill" Hickok came to represent the Wild in the Wild West, capturing the imagination of people who lived in the civilized world back east.
And yet many of the deadliest shootists from the Old West were overshadowed by the more famous names mentioned above, despite the massive body counts they had under their belt.
John Wesley Hardin is said to be "the worst bad man that Texas ever produced", who claimed to have killed 42 men and committed his first murder when he was just 15 years old.
Hardin was so quick tempered he supposedly shot a man for snoring.
"Killin' Jim" Miller is another deadly shootist time forgot, and despite being a bit of a dandy he is thought to have gunned down close to 50 men in cold blood.
Jim's life of crime began when he blew away his sister's husband with a shotgun after a disagreement, and was known to tell folks he would kill anyone for money, including politicians, marshals and Sheriff Pat Garrett himself.