The text feature of boldface is most often used to indicate which of these?

In the American Southwest of the late 1800s, the introduction of barbed wire fencing led to fierce disputes between ranchers and farmers, both eager to protect their rights and their livelihood. The farmers were the clear winners of the two groups, and the barbed wire fences stayed and proliferated. Barbed wire proved to be ideal for use in western conditions; it was cheaper and easier to use than the alternatives of wood fences, stone walls or hedges. Within a few decades all the previously open range land became fenced-in private property. This change was so dramatic to the western culture... Show more

In the American Southwest of the late 1800s, the introduction of barbed wire fencing led to fierce disputes between ranchers and farmers, both eager to protect their rights and their livelihood. The farmers were the clear winners of the two groups, and the barbed wire fences stayed and proliferated. Barbed wire proved to be ideal for use in western conditions; it was cheaper and easier to use than the alternatives of wood fences, stone walls or hedges. Within a few decades all the previously open range land became fenced-in private property. This change was so dramatic to the western culture that some consider the introduction of barbed wire fencing to be the event that ended the Old West period of our history.

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