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I guess whoever invented the Borg computer system assimilated himself, then assimilated his own species.

Apocriphally, Human should be the species 0001 cause Borg are the offspring oh Human-Caeliar.

It wasn't necessarily a single person. Indeed, considering the Borg have been around for so very long (they controlled a number of solar systems as early as 1484 (VOY: "Dragon's Teeth"), assimilation techniques were probably far more complicated in the beginning, making it very difficult for a single person to assimilate an entire civilization.
Indeed, dialogue in "Star Trek: First Contact" and TNG: "Q Who" suggest a far more gradual evolution that began "thousands of centuries" ago, probably beginning with an increasing influence of technology on people's everyday lives, which in turn led people to implement technology into their own bodies in an atempt to better themselves. As they began to interface more and more with information technology, they gained an extended consciousness, which over a long period of time developed into their collective consciousness. Perhaps there was a faction of them that introduced some changes by force using some invasive program, but that was probably just the straw that broke the camel's already over-burdened back.
We can look at the Borg as a possible future for mankind. Perhaps a very exaggerated preview of that future, but notwithstanding one which seems more and more real for every passing year. Right now, I'm connected by my headphones to my computer and my computer is in turn connected to the power grid by a power cord; this may be rather a shallow "conection", but I nevertheless sometimes find it a bit frightening how much time I spend connected to a wall by a series of wires.
Less superficial is my connection to the internet, which allows me to complement my own thoughts with information gathered from Memory Alpha, Wikipedia and many exabytes of other sources of information composed by hundrds of millions of people; the extended mind is very real, and my life would be very different without it.
We shouldn't be afraid of technological development, but it's important to stop every now and then and thinking of how it affects our lives; to weigh the gains against the losses. I feel that the Borg are the most terrifying when they are taken as a reminder of that.
Getting back to your question: The speicific origins of the Borg have never been detailed in canon, but at Memory Beta you can read about some of the soft canon explanations: --Tesseraktik 10:34, May 28, 2011 (UTC)

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