I'm not sure 100% what exactly this question is asking, but I know World War 1 was the first war to include Gas masks and Chemical warfare, so that is more than likely the answer.
Answer:
Explanation:I think it is becuase japan thuoght the US was a enemy and they were exporting goods at pearl harbour to their
Hitler blames the Jewish people for Germany's problems, and with the help of other Nazis, triggers the Holocaust.
The question will be more answerable if the entries are there.
B people all over china could read it
