How was the first world war unleashed?

The reason for the outbreak of the First World War was the assassination in the city of Sarajevo of Archduke Franz Ferdinand and his wife Sofia Chotek. But it was just a formality. The preconditions for the outbreak of war have long been ripe in Europe. The real reason for the outbreak of the war was the struggle for dominance in Europe, Africa and the Middle East between the Quadruple Alliance and the Entente. Some countries had territorial and economic claims to each other. Other countries were bound by alliance treaties with the initiators and were forced to enter the war.