What invention farmers prevent cattlemen from driving their herds through farms?
spotlight
windmill
barbed wire
split-rail fencing

Farmers couldn't fence their whole lands at first. It was too pricey and time consuming. Also, farmers, at first, had no reason to fence their lands until the cattle started running over it.

It was when the barbed wire was invented that things changed.

Fencing became much cheaper with barbed wire than with wood and since the cattle could be hurt and even get stuck in the fences, but for sure not go through, it solved the problems of the farmers.

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