What were the range wars?

A range war or range conflict is a type of usually violent conflict, most commonly in the 19th and early 20th centuries in the American West. The subject of these conflicts was control of "open range", or range land freely used for cattle grazing, which gave the conflict its name

The range war or range complex is a type of usually violent conflict most commonly in the nineteenth and early twentieth century and the American West. The subject of these complex or control of open range or rangeland freely used for cattle which gave the conflict its name.

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i think your answer there is c

the passage of a strict fugitive slave law