Final answer:
Economic reasons, decline of cattle drives, and rise of large meatpacking plants led to the closure of the Cargill plant in Plainview, Texas.
Step-by-step explanation:
The Cargill meat packing plant in Plainview, Texas closed down due to economic reasons. The decline of the cattle drives and the invention of barbed wire contributed to the decline of the open range and the rise of large meatpacking plants in cities. Philip Armour and Gustavus Swift created huge processing facilities closer to the supply of Midwestern cattle, reducing shipping costs. This shift in the industry led to the closure of smaller, local meatpacking plants like the one in Plainview, Texas.