Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Cheyenne:

"

During the California Gold Rush, emigrants brought in cholera. It spread in mining camps and waterways due to poor sanitation. The disease was generally a major cause of death for emigrants, about one-tenth of whom died during their journeys.[citation needed]