A blockade is a strategy used to prevent goods, services, or people from entering or leaving a specific area. This can be done by military forces, ships, or other means to control access and restrict movement. Blockades are often implemented during conflicts or wars to weaken an opponent's resources and capabilities. Historically, blockades have been used in various conflicts, such as the American Civil War and World War I. They can have significant economic and humanitarian impacts, affecting not only the targeted area but also surrounding regions. Blockades may lead to shortages of essential supplies and can escalate tensions between involved parties.