I what way would factories and iron steel production be an advantage in the civil war begins ?

Which of these belongs to the united states after the spanish american war ?

The transcontinental railroad runs from the to the i. north ii. south iii. east iv. west a. i and ii b. ii and iii. c. iii and iv d. ii and iv

How did the actions of tsar nicholas 2 and his wife lead to revolution in russia