Answer:
2
Explanation:
learned this in history class.
I think the correct answer from the choices listed above is option 4. The refrigerator car is the invention which was most important in revolutionizing the meat industry. It <span>is a </span>refrigerated <span>boxcar, a piece of railroad rolling stock designed to carry perishable freight at specific temperatures.</span>
The north wanted the south to change its work gain, such as slavery and change more into industry