How did the North achieve victory in the Civil War?

through attrition and massive advances on several fronts" is the correct answer. The main advantage of the North was that there were far more soldiers than in the South.

Explanation:

The North had been more industrial, while the south was poor the north was rich! Also the North was fighting for reunification!

Hope this is helpful!!! Sorry if it's not clear enough! :-)

d.he wanted to send diplomats to communist countries.