GM’s $7 billion bet on electric vehicles is the largest single investment in the company’s 116-year history, and it lands squarely in Michigan. The plan upgrades an assembly plant near Detroit to build battery-powered Chevy Silverado and GMC Sierra pickups, while a new facility in Lansing will produce the battery cells to power them. Together, the two sites will create more than 4,000 jobs and the capacity to build 600,000 electric trucks a year. Pickups are America’s bestsellers and among its heaviest emitters, so electrifying them at this scale shifts the emissions math of the country’s roads — and signals that the question for legacy automakers is no longer whether to go electric, but how fast.