Books
Phase
Post-Civil-War U.S.–Mexico Borderlands
1865–1880 CE
The U.S.–Mexico borderlands after the Civil War were shaped by migration, smuggling, former soldiers, political refugees, ranching, raiding and the weak reach of formal law. The border offered both escape and opportunity for men displaced by war.
This setting mattered because loyalty and legality could change across a river, town or jurisdiction. Local disputes could become international incidents, and private violence could be justified as politics, revenge or frontier necessity.
Troubled Border uses this kind of setting when Nate Carlton discovers that a bank raid is tied to a cause larger than simple theft.