Which of the following is not an aim for the existence of a State?

The aim of promoting a common lingua franca is not necessarily a requirement for the existence of a state. While it can be helpful in facilitating communication and fostering unity among diverse groups within a state, it is not a fundamental necessity for a state to function. On the other hand, the other options listed are crucial for the existence of a state. The promotion of economic independence is necessary to ensure that a state can sustain itself and meet the needs of its citizens. The provision of welfare services is important to promote the well-being and quality of life of the people within a state. The maintenance of external relations is crucial to ensure that a state can engage with other nations and protect its interests in the international community. Overall, while the promotion of a common language can be beneficial for a state, it is not as fundamental to the state's existence as the other aims listed.