Why was it so important to the South’s Civil War effort that Texas maintain control of its ports?

At the time of the Civil War, the South had an agriculturally-based economy and there were no manufacturing plants. All of the manufacturing plants that produced things like shoes, clothes, ammunition, and food were in the North. Therefore, when the war began, the South had to rely on receiving goods and supplies from the outside – from their trade partners in Europe. The South did not have enough of their own supplies to last through a long war. Therefore, ports throughout the South became very important as a way of keeping troops and families alive. One of the main ways for goods to reach the Confederacy was through Texas ports. The Confederate coast was lengthy and difficult for the Union to shut down. A key role for Texans was to keep its ports open and free from Union control.

Explanation:

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the answer is d. tariffs were raised by america's trading partners after the smoot-hawley tariff act, decreasing exports, and declining job rates.

c, they united with once