The setting is northern Mexico starting in 1898 where an economic boom, a dictator who welcomes foreign investment and wide-open land set the stage for one of the greatest capitalist free-for-alls in history. Each player is an hacendado. These entrepreneurs vie to build the largest empire of railroads, mines, ranches and other businesses. They may employ banditos, strikers and other sneaky maneuvers to tax, bribe, raid and destroy their opponents, often employing police, federal troops, even the US Army. They may even get themselves elected to the governor's office or the presidency itself (a crime in Mexico).
This document brings together errata and Q&A from the designer from multiple sources on the net, mainly Grognard.com. Used with the second edition rulebook it covers most issues that may arise. None of these are my answers, as far as I know they all came originally from Phil Eklund.