The United States as usual has a sizable deficit in the current account of its balance of payments, trade account and other current accounts, current account items.
Back in those days, in the fifties and sixties, countries had balance of payment's deficits or surpluses, those were reflected much more than today in movements of reserves among countries.
So if the euro, if Euroland is to become a reserve center, if the euro is to become a reserve currency, Euroland will have to have a deficit in its overall balance of payments.