How did the Civil War begin?

with the Battle of Hampton Roads

with a Union attack on Fort Sumter, South Carolina

with a Confederate attack on Fort Sumter, South Carolina

with a battle in Charleston harbor

Commercial agriculture consists of raising food for trade and profit, while subsistence agriculture focuses on -- a. providing the basic needs of the farmer's family b. providing the basic needs of the neighboring communities c. creating more arable land for future use d. obtaining subsidies from governments and corporations