Sued in the Dirksen courthouse for hundreds of millions of dollars based on alleged violations of state consumer-protection laws, Walgreen Co. argued that the federal court lacked diversity jurisdiction because one of the plaintiffs — Group Hospitalization and Medical Services Inc. — is “stateless” under a 1916 U.S. Supreme Court decision because it is a congressionally chartered corporation.Analyzing Bankers Trust Co. v. Texas & Pacific Railway Co., 241 U.S. 295 (1916), and 28 U.S.C. Sec. 1332(c)(1) (enacted in 1958), …