The world came together to build 5G. Now the next-generation wireless technology is pulling the world apart. The latest version of the 5G technical specifications, expected Friday, adds features for connecting autonomous cars, intelligent factories, and internet-of-things devices to crazy fast 5G networks. The blueprints reflect a global effort to develop the technology, with contributions from more than a dozen companies from Europe, the US, and Asia. And yet, 5G is also pulling nations apart.