Why was the march of sea important to the union war?

The March to the Sea, led by Union General William Tecumseh Sherman in late 1864, was crucial for the Union war effort as it aimed to undermine the Confederacy's economic and military capacity. By marching from Atlanta to Savannah, Sherman employed total war tactics, destroying infrastructure, supply lines, and civilian property, which demoralized the Southern populace and weakened their resolve. This campaign not only helped secure a significant Union victory but also demonstrated the effectiveness of strategic, destructive warfare, ultimately contributing to the Union's success in the Civil War.