AUSTRIAHUNGARY
France and Britain had promised to declare war if Germany tried to obtain anymore territory. And they kept that promise when Poland was invaded.
The German invasion of Poland on 1 September 1939.
No.
no
germany
In both.
Any country can declare war on anybody else. What matters is can you back it up?
Belgium. Neutral Belgium was attacked by the Germans on there way to France
Austria-Hungary.
Pearl Harbour.
yes