DETROIT, July 11 — Can the mystique of a British sports car be recreated by a Chinese company in America’s heartland? That’s the bet by Nanjing Automobile Group, which plans to resurrect the fabled MG marque in a tricontinental demonstration of how truly global the automotive industry has become. Nanjing, which purchased the assets of the bankrupt MG Rover Group last year, aims to be the first Chinese carmaker to open a factory in the United States. The company has scheduled a news conference for Wednesday in Oklahoma to announce plans to build a newly designed MG TF Coupe there,...