From the introduction:
Savage Sidewinder focuses on the Old West during the 19th century on the North American continent. As such, it is best described as a “traditional Western,” set against the historical backdrop of westward expansion in the USA. The core book provides ideas and guidelines for running a game in either of two time periods during the 19th century: 1804–1848 or 1849–1899.
The Savage Sidewinder core book provides extensive historical background for playing games in both eras, with suggestions for game mechanics and role-playing flavor influenced by the historical events during each period.
This Player's book for Savage Sidewinder provides everything needed to design a character for the Judge's game. Talk to your Judge about the era, tone, and flavor of the game as you design a character.