Final answer:
New Orleans was a key Confederate port, essential for cotton export and supply transport due to its strategic location on the Mississippi River. The Union captured it to disrupt Confederate logistics and gain river control, which was crucial for victory.
Step-by-step explanation:
During the Civil War, New Orleans was of paramount importance for several reasons. It was a key port for the Confederacy, acting as a critical hub for the export of cotton from across the southern states. Its strategic position near the mouth of the Mississippi River made it vital for the transportation of supplies and communication. The Union understood this and captured New Orleans in the spring and summer of 1862 to gain control over these critical aspects of the Confederacy's war efforts. Moreover, taking New Orleans was a significant step towards achieving control over the entire Mississippi River, which was crucial for splitting the Confederacy and restricting their ability to move goods and troops.