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Chevrolet Bolt EV being charged outside Go Forth electric-car showroom, Portland   [photo: Forth]It hasn't emerged much into the public eye, but some advocates and auto-industry sources have had quiet discussions on whether the U.S. will continue to lead the world in electric-car technology in a new decade. California remains the epicenter of plug-in car adoption, with roughly half the country's electric-car sales over seven years recorded...