if this is a multiple answer quetion it will be France, Great Britain, the Soviet Union, and The United States all controlled different parts.
I think the correct answer for that would be to B.Declare War
OK so basically the main reason that had caused WWI was when the arch duke of Austria Hungary Franz Ferdinand was assassinated because the assassin had ties to a military group called the black hand so it had caused European powers to collide against each other.
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Answer:
Nazi Germany invaded Poland
Explanation:
