All of the above are correct (apex)
the turnpike was the invention that made the growth of railroads possible
The growth in the use of railroads was made possible because of cattle shipments. The Industrial Revolution was also a major factor in building more railroads.
Improvements in iron and steel production
ships and railroads
It helped bevause it made it possible for people to market flour and coal.
The railroads were made in the 1850's - 69's
coal industry
The expansion of the American steel industry and railroads during the civil war was made possible by Andrew Carnegie. Mr. Carnegie was a Scottish American industrialists who is known for leading the steel industry expansion.
Improvements in iron and steel production
railroads helped transport steel to other places
Railroads made it easier to get to seaports in western Europe.
Railroads