You could read the article. It was actually DARPA, from the department of defense and not the CIA, who initially created the first working network. But it was some time later that CYCLADES in France demonstrated the first inter-network with a lot of the working concepts that later would make the internet as we know it today. It wouldn’t go global until we invented the TCP/IP protocols, that was a joint effort of a lot of universities over in Europe and the USA.