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Submarine Warfare
I think it's unrestricted submarine warfare.
Belgium
belgium
belgium
Belgium
One action that the Germans took, which violated the laws of neutrality, was their use of unrestricted submarine warfare. This involved sinking merchant ships, including those of neutral countries, without warning. Another action was the Zimmermann Telegram, in which Germany proposed an alliance with Mexico against the United States. These actions led President Wilson to believe that Germany was disregarding the principles of neutrality and posing a threat to American interests.
When Belgium was invaded by Germany. This violated the Belgian Neutrality Treaty that the Germans signed. They regarded it as a "scrap of paper".
they had a big navy and used a violated belgian neutrality to enter and fought Germany
Invading Belgium on their way to attack France in WWI and WWII.
Belgium
Genet