should the supreme court have made a decision for the whole country or should individual states have the right to make their own decision?

individual states, but they can do it for the whole country if its serious.

Explanation:

the railroad industry led to the development of other processes.

Explanation:

Having refrigerated train cars allowed meats to distributed throughout America, allowing the agricultural economy to benefit, ultimately enabling the US to profit. It also created a whole new industry, creating more jobs in certain cities. Those cities had to create housing etc to accommodate the influx of people coming in for jobs.