Colossus: The Forbin Project (1970)
https://archive.org/details/colossus-the-forbin-project-1970The US has built an AI system with the goal of ending war. They have put the security of the country under the control of this AI called "Colossus." Colossus quickly discovers that "there's another," meaning another AI system, built by the USSR. These two agents then hook up, share all their knowledge, and develop their own new language that humans cannot understand. Now the entire world is under the control of this AI.
The rest of the film shows the attempts of man to wrest control back from Colossus.
Pretty much the only thing that looks different from today is the form-factor of the technology. I encourage everyone to view this (streams free at the Internet Archive). Aside from the overall message, it was refreshing to travel back to that era and see mid-century aesthetic (notwithstanding the blatant sexism...). The film itself barely uses any musical score, or at least I hardly noticed one--also nicely refreshing.
Go watch it and come back and let's discuss it. It could hardly be more relevent today.
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Thanks 
I'd have a foreign country making the mistake, stemming from something like poor coding and/or myopic safeguards allowing A.I. to take over their defenses and then those of the U.S. and Russia. Sounds more realistic to me.
Oh-oh. Just found this on Wikipedia:
Remake
Imagine Entertainment and Universal Studios confirmed that a remake titled Colossus, to be directed by Ron Howard, would be in production as of April 2007. Officials were quoted as saying: "Universal and Imagine Entertainment will remake the 1970 science fiction saga Colossus: The Forbin Project as a potential directing vehicle for Ron Howard, reports Variety. Brian Grazer will produce. Jason Rothenberg has been set to write the screenplay for a movie to be called Colossus. Based on a book by D.F. Jones, the original film was a forerunner of movies like Terminator, introducing the idea of a government-built computer that becomes sentient and then takes control."
In October 2010, the project moved forward with the announcement that Will Smith would star in the lead role, with the script being written by James Rothenberg. "Will Smith is set to collaborate with director Ron Howard on the forthcoming sci-fi feature The Forbin Project. But now it looks like the project might be back on track as Variety’s reporting that Universal has hired writer Blake Masters (Law & Order: LA) to do a new draft of the script. There’s no word if Ron Howard is still on the project, but it’s possible since it will be produced by Howard’s business partner Brian Grazer".
Variety also reported in July 2011 that Universal replaced Rothenberg with Blake Masters to do a new draft of the script. In March 2013, it was announced that Ed Solomon, screenwriter of Men in Black and Bill & Ted's Excellent Adventure had been brought on board to rewrite the film's script. "After struggling in developmental limbo since 2007, Colossus – the remake of the 1970s science fiction thriller 'Colossus: The Forbin Project' starring Will Smith – has been given a much-needed boost. Ed Solomon ... has been brought on board to rewrite the film’s script and breathe new life into the project". No further details emerged regarding the remake.
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Please, NOT WILL SMITH. He. Can't. Act. The team of Ron Howard/Brian Grazer is totally wrong too. As is Ed Solomon.
A.I. taking over is too real and too terrifying and needs to scare the crap out of everybody. A.I. in fascist form. That type of thinking.