Step-by-step explanation:
It is not possible for me to determine which book you are referring to as there may be several books with the title "Ground Zero". However, if you are referring to the book "Ground Zero" by Alan Gratz, then the logging camp was not shut down by Americans in that book.
Instead, "Ground Zero" is a novel about the September 11, 2001 attacks on the World Trade Center in New York City. The book tells the story of two middle school students, Brandon and Reshmina, who are on opposite sides of the world but both affected by the events of 9/11. The book does not mention a logging camp or any American action to shut it down.
If you are referring to a different book titled "Ground Zero", please provide more information so I can better assist you