Infinite Time Travel, Starting from Becoming a Bounty Hunter

After an accident, Zhang Fan traveled to the American West during the Great Pioneer Period. The system is just standard equipment for time travellers. Mission, isn't this also routine... Wait a minute, you want me to end the Civil War? How much influence can one person have on the course of a war? "Hmph, I've wanted to try it for a long time." Zhang Fan actually felt that such a task was worthy of him.