Question

Farms, slaughterhouses, supply stores, and banks were all considered characteristics of what area?

Answer 1

None of the above.

Farms tended to be, obviously, in open country.

Slaughterhouses were equally obviously near the consumer; in other words, in conurbations with good rail connexions to major industrial/financial centres - Chicago springs to mind. At first cattle were driven there on the hoof; as railways were extended, cattle ranching became possible further away.

There were banks - at least local branches of them - everywhere. The presence of a bank is not a distinguishing feature.

Supply stores were features of distant rural communities. You would not find them in cities where retail trade was established and where there were industrial scale slaughterhouses, but you would find them in small towns associated with farming communities.

So there is no area defined by the presence of all four of the institutions you mention.