The terms First World, Second World, Third World, and Fourth World only referred to economic conditions of different parts of the world.

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These terms originally referred to political and economic systems, with the First World denoting capitalist, industrial countries, the Second World referring to communist-socialist states, and the Third World relating to nations that were not aligned with either bloc during the Cold War. The Fourth World describes impoverished communities without a state, often indigenous peoples.

The Terms First World, Second World, Third World, and Fourth