Persistence and determination.
North because they won! North had more reasons to STOP slavery then south keeping slavery.
Much bigger population from which to recruit armies. Most talented President the Americans ever had.
The north won.
The NORTH won
Fluor won the North, DynCorp won the South
North Korean won was created in 1947.
North
The North won.
The North won
North Carolina was established for economic reasons.
There are many reasons the north won the war, including more troops (population) and more weapons (industry) but I personally think the main reason is because of transportation. The north had railroads that they could use to transport men, food, and weapons to wherever they're needed most faster than the south could.
the north