NEW YORK/BUENOS AIRES (Reuters) – Argentina offered a $6.5 billion cash payment to creditors suing the country over defaulted bonds on Friday, seeking to end a festering 14-year legal battle that transformed the country into a financial markets pariah. Two out of six leading bondholders have already accepted the offer, the U.S. court-appointed mediator said, hailing the proposal by Argentina’s new, business-friendly government as an “historic breakthrough”.