The purpose of a military a0 is to control who goes in or out of a place.

Blockade

Explanation:

A military blockade is a strategy commonly used in times of war in which an armed force isolates an important area from the enemy. This occurs when an armed force surrounds a fortified place and isolates it, but continues to attack it. This usually happens to places that are strategic to the enemy. A military blockade is also known as a siege.

a plantation economy is an economy based on agricultural mass production, usually of a few commodity crops grown on large farms called plantations. plantation economies rely on the export of cash crops as a source of income.

i hope this : )