What country did Germany invade that caused great Britain to enter the war?

Answer 1

Poland. Germany had previously agreed in the Munich Agreement that if they were allowed to annex Sudetenland of Czechoslovakia they would not invade anywhere else. The Agreement was signed by Germany, Italy, Britain and France. Italy was allied with Germany so Britain and France declared war when Hitler invaded Poland in direct violation of the agreement.

Answer 2

The Foreign Secretary, Sir Edward Grey, spent much of the summer of 1914 furiously trying to reassure Russia and Germany and prevent a war happening. Even when German troops invaded France and Belgium as part of the Schlieffen Plan, Britain did not have to go to war.

Answer 3

The country that Germany invaded forcing Britain to join WW1 was Belgain.

Answer 4

Belgium

Answer 5

Poland.