In his chapter "Rise of the Killing Machine," historian Benjamin Madley refers to the systematic and violent campaigns against California Indians during the mid-19th century, which were characterized by organized efforts to exterminate or forcibly remove Indigenous populations from their lands. This "killing machine" was not merely a metaphorical construct but a reflection of the brutal reality faced by California Indians as settlers expanded into their territories, driven by the ideology of Manifest Destiny and the economic motivations of the Gold Rush.