Answer: A
Barbed wire
Explanation:
Barbed wire stopped cowboys from passing through people's land. Cowboys would herd cattle with their horses and lead them to auctions. The "long drives" were the journeys of the cowboys.
The invention that ended the era of the long drives of the 19th century was barbed wire.
The era of the long drives was a period in which there was free ranching in the United States. During this period, cattle was allowed to roam freely on an available land.
Meat was expensive in some cities bringing about lots of entrepreneurs. The open range system effectively got to an end after a lot of people bought barbed wires and fenced their properties.
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