The seizure of several thousand humans from the American West in the 1860s by the Skagarans, who carried them to a planet in the Delphic Expanse to work as slave labour.
In the 1860s a Skagaran ship took humans from the western frontier of North America and transported them to a world in the Delphic Expanse, intending to use them as labourers for a new colony.
The captives rose up under a man named Cooper Smith, destroyed the Skagaran ship and overthrew their masters. Their descendants then kept the Skagarans, whom they called Skags, as a legally oppressed underclass, forbidden schooling and property, while preserving the culture and technology of the Old West.
Enterprise NX-01 finds the settlement of about six thousand people in 2153 in the episode North Star. Captain Archer reveals his origin to the townsfolk and promises that Earth will return for them, urging them meanwhile to end their mistreatment of the Skagarans.