PART II NEUTRAL RIGHTS AS AFFECTED BY SUBMARINE OPERATIONS, ETC.-Continued THE SEVERANCE OF RELATIONS WITH GERMANY, FEBRUARY 3-EFFORT AT RESUMPTION OF NEGOTIATIONS THROUGH THE SWISS MINISTER, FEBRUARY 11-MAINTENANCE OF RELATIONS WITH AUSTRIA-HUNGARY, TURKEY, AND BULGARIA— REFUSAL OF THE EUROPEAN NEUTRAL GOVERNMENTS TO FOLLOW THE EXAMPLE OF THE UNITED STATES IN SEVERING RELATIONS WITH GERMANY; THEIR PROTESTS TO THE CENTRAL POWERS-SUBMARINE ATTACKS ON AMERICAN SHIPS AND SHIPS WITH AMERICANS ABOARD RECEIPT, FEBRUARY 24, OF THE ZIMMERMANN TELEGRAM CONVEYING GERMANY'S OVERTURES TO MEXICO |