Alien Corporations

For purposes of 28 U.S.C. s1332, what is the citizenship of a corporation that is incorporated domestically and that has its principal place of business abroad?  Yesterday, the Seventh Circuit correctly concluded that such a corporation is only a citizen of its state of incorporation; a foreign principal place of business is  irrelevant.  The Seventh Circuit's conclusion is consistent with the one I reached in Consistent Deeming:  A Cohesive Construction of 28 U.S.C. s1332 in Cases Involving International Corporations and Permanent-Resident Aliens.

--RR