In the past the Germans have invaded many countries, but the neutral country invasion that angered Americans most was the invasion of Belgium.
It moved military forces through a neutral country.
Belgium
the German invasion of neutral Belgium
Luxembourg was a neutral country during World War II but was invaded by Germany in May 1940. After the invasion, it was occupied by German forces and effectively became part of Nazi Germany. While Luxembourg's government-in-exile supported the Allies, the country itself was not an active participant in the war on either side.
In the past the Germans have invaded many countries, but the neutral country invasion that angered Americans most was the invasion of Belgium.
American public opinion turned against Germany in WW One & WW Two for various reasons. In WW1, Germany invaded France & Belgium in August 1914. Because, Belgium was a neutral country, Americans were upset with Germany. The invasion of Belgium however was not the most important factor. Later, German unrestricted submarine warfare also turned American public opinion against Germany. Then as a final straw, the German's Zimmermann telegram message to Mexico further angered Americans. In WW2, Germany invaded Poland, neutral Denmark, neutral Norway, neutral Holland, neutral Belgium, and so forth on & on. German submarine warfare also turned public opinion against Germany.
Germany's brutal invasion of neutral Belgium
Germany is the only German-speaking country that is not neutral. Austria and Switzerland are both considered neutral countries.
Germany's brutal invasion of neutral Belgium
It moved military forces through a neutral country.
Belgium
Switzerland
the German invasion of neutral Belgium
britain and the neutral countries
The Zimmerman note, a not-so-secret telegram from the German foreign affairs minister to the President of Mexico intercepted by Americans. It proposed that, if Mexico teamed up with Germany against the US in WWI, Mexico could regain Texas, New Mexico, and Arizona. This turned US public opinion, which was previously pretty neutral, against Germany.
Countries in Europe not occupied by German In WWII: Britan (Allied) Iceland (Allied) Switzerland (Neutral) Sweden (Neutral) Ireland (Neutral) Spain (Neutral)