Why was the union interested in blocking and capture the port of Galveston?

The Union aimed to block and capture the port of Galveston during the Civil War primarily to disrupt Confederate trade and supply lines. Galveston was a crucial port for the Confederacy, facilitating the import of goods and the export of cotton. By taking control of this strategic location, the Union could weaken the Confederate economy and enhance their own naval blockade, ultimately aiding in the overall goal of defeating the Confederacy. Additionally, capturing Galveston would provide the Union with a foothold in Texas, further extending their military presence in the South.