The NSA is tasked with a highly technical and specific job: making and breaking codes and monitoring other people's communications. The CIA handles human intelligence mostly: agents, stealing stuff, reading foreign newspapers and journals (you'd be amazed how much can be learned from this open source intelligence).
It was felt that it was best to keep the mathematicians and computer people at NSA separate, and most countries do the same thing, with Britain having SIS as the CIA equivalent and GCHQ as the NSA one.
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