As dictated by a promise made, France and Britain immediately declared war on Germany after the invasion of Poland.
Basically: the English Channel and the Royal Navy.
39 European countries
No it was not - Nazism started in Germany, and from Germany they started their invasion and occupation of other Countries.
Three countries in the European Union are France, Germany, and Italy.
Italy are one of Germany's allied since the invasion of Europe.
Switzerland
You are referring to Germany which used to be West Germany and East Germany.
The dislike of Germany from multiple countries began after their invasion of Poland. During WWII, the first two countries to declare war on Germany were Great Britain and France.
France, Germany the Netherlands and Belgium are but a few countries in Europe.
Germany and Italy are the biggest countries in the EU.
Germany and France