In February 1915, the United States warned Germany about misuse of submarines; but on May 7, Germany torpedoed the British passenger liner "RMS Lusitania", sinking her.
The United States warned Germany about misuse of submarines. This was in February 1915. Germany torpedoed the British passenger liner "RMS Lusitania". This was on May 7. Germany was sinking her. This was on May 7.