The 1939 invasion of Poland caused Britain to declare war on Germany, which started WWII.
ohio
The specific reason was that German forces invaded Belgium on their way to France. Britain, France and Prussia (the key forerunner of Germany) had guaranteed Belgian neutrality in 1839 (and again in 1875). Moreover, Britain was an ally of France and was not willing to let a substantial part of the coast opposite Britain fall into unfriendly hands.
France, Spain, Great Britain, and the United States of America
When Germany invaded Poland, France and England declared war on Germany, this started WWll
Britain and France
France and later Great Britain
Three countris had the claims: France, Spain, and Great Britain.
Belgium .
italy
Poland.
The 1939 invasion of Poland caused Britain to declare war on Germany, which started WWII.
Poland
Czechoslovakia
if you mean which country it was Poland
It was claimed by a mixture of European countries, but France had the largest claim.
1939