Britain had a treaty to protect the neutrality of Belgium.
In September 1939, Germany and Slovakia invaded Poland. This lead to many countries declaring war.
Technically, Serbia. However WWI is widely referred to by Historians as 'The War Nobody Won'. Austria declaring war on Serbia, the Serbs’ allies Russia declaring war on Austria, the Austrians’ allies Germany declaring war on Russia and the Russian’s allies France and Britain declaring war on Germany. America eventually entered on the side of Serbia et al due to a few incidents with German U-boats and Germany surrendered. If you work backwards operating under the system of official declarations via the various alliances the winner is Serbia (whose country was mostly pounded into gravel in the process) and their allies: Russia, France, and Great Britain.
us mail was censored to prevent treason.
By Nazi Germany invading Poland, and Britain's ally, France joining Britain in declaring war against Germany, which in turn led Japan to declare war against Britain and France, which then escalated the war from a pan European to Global (eventually).
The German telegram to Mexico and the sinking of U.S. merchant ships.
This is an opinion question, there is not a specific answer. Look at the reasons that Germany and Japan went to war, and then you can determine for yourself if they were justified.
America declaring war on Nazi Germany and joining the Second World War in Europe.
it became global
it became global
mobilization
Germany declared war on Poland, which led to England and France declaring war on Germany.
Russia declaring war on Germany to protect its ally Serbia.
Transformed peacetime industries into war industries
Germany allied with Japan, Japan attacked America Germany had no choice and Hitler was not happy as he wanted to keep America out of the war.
Germanys attack on Poland in 1939
so there are less canadians