What was economic blockade

A blockade is an effort to cut off supplies, war material or communications from a particular area by force, either in part or totally. A blockade is not an embargo or sanctions, which are legal barriers to trade. It is also distinct from a siege in that a blockade is usually directed at an entire country or region, rather than a fortress or city. While most blockades historically took place at sea, blockade is still used on land to prevent someone entering a place.

Explanation:

yuh :)

the answer would be a)henry grady because he came up with the term "new south"