I believe its false. You should pick up debris no matter if anyone notices or not.
The assassination of Archduke Franz Ferdinand in Sarajevo on 28th June 1914, it triggered a chain of events that resulted in World War 1. President Woodrow Wilson declared that the United States would remain “impartial in thought as well as in action.” At the time, a vast majority of Americans approved of Wilson's policy of strict U.S. neutrality.
Can you give more details, please?