Surrounding an enemy’s territory in wartime to keep people and supplies from passing.

An extremely powerful nation.

Destroyed or Ruined

System where the government owns the factories and natural resources and controls the production of goods

A natural or human-made item that orbits a planet.

A competition between countries to achieve superiority in technological advancements and achievements related to outer space.

A competition between countries to achieve superiority in quantity and quality of military weapons and technology.