A union of independent sovereign states is called confederacy.
A confederacy is an association of sovereign states or communities. Confederacy may include tribes, states or communities.
In a confederacy states or people join together for a particular purpose, usually related to politics or trade.
In the American Civil War, Confederacy was the group of southern states that fought to leave the United States and keep slavery.
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Carthage, a seaside suburb of Tunisia’s capital, Tunis, is known for its ancient archaeological sites.
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In regions of the world dominated by religions other than Christianity
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Trench Warfare. They built trenches with tunnels connecting them so they were sheltered from long range enemy fire. Soldier were put on guard, positioned to watch from the trenches.