Final answer:
The three main Union strategies during the Civil War were securing extensive supply lines, retaining border states to isolate the Confederacy, and using their larger forces and industrial capacity to encircle and divide Confederate territories.
Step-by-step explanation:
Union Strategies During the Civil War::
The main northern strategies for winning the Civil War included a comprehensive approach to undermine the Confederacy's war efforts.
Firstly, the Union aimed to establish long and secure supply lines to support their armies.
Secondly, they aimed to retain the border states within the Union to isolate the Confederacy and deny it of critical resources and potential manpower.
Lastly, another strategy was to leverage their numerical superiority and industrial resources to encircle and divide the Confederate territory, cutting off their ability to communicate and resupply.
These strategies were crucial given the South's defensive advantage of fighting within familiar territory with civilian support. The North's strategic planning was central to the Union's ultimate victory, as it allowed them to capitalize on their advantages in population and industry over the Confederacy.