The jurisdictional immunities of the States are in full mutation. The interventionism of the State in the economic world has turned the paradigms of understanding immunities upside down. The unbridled development of commercial activities in the 19th century led the various national legislations to make a distinction between acts performed by a State.If, in the current state of international law, sovereign immunities are shrinking like a stone, this evolution has been slow and progressive. It was necessary first to demystify the prince, then the State.The least that can be said is that, faced with a heterogeneous international landscape, there have been attempts at codification to standardize norms.Have these attempts been successful? The answer to this question can be found in this book. It is an invitation to discover it.