How did trains and steamboats cause big changes in the North of the United
States?

Train and Steamboats changed Not Of United States because it was a new way to transport people and many of they're goods as well!!  

the communist manifesto is an 1848 political pamphlet by the german near the end of the manifesto, the authors call for a "forcible overthrow of all existing social conditions",  ..

it would be a. that is the only one i could think of