Answer:
Rail is a reliable shipping method on land and it's environmentally-friendly. You can ship machinery or even perishable goods by rail because it's fast and efficient. There are schedules and reliable delivery times, so you'll know when your goods are expected to arrive at their destination.
The War of 1812.
A war between the US and G. Britain caused by American outrage over the impressment of American sailors by the British, the seizing of American ships, and British aid to the Native Indians attacking the Americans on the western frontier. All this enhances the feeling of nationalism among the Americans and caused the war of 1812.
Domestic slave trade was common because it was believed to increase productivity.
Answer:
I think it is large outbreaks of Polio
