How did the U. S. expand in the late nineteenth century?

The late 19th-century United States is probably best known for the vast expansion of its industrial plant and output. At the heart of these huge increases was the mass production of goods by machines. This process was first introduced and perfected by British textile manufacturers.

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must repent and believe in god.

or the book

journey across time - chapter 10 "the rise of christianity"

that would be the steamboat because none of the other things are forms of transportation