WW1 actually started as a conflict between the small country of Serbia and Austria-Hungary because Serbia supported the assasination of the Archduke or Austria-Hungary. Because Serbia was in an alliance with Britain, it had an obligation to enter the war, along with many other countries that entered on both sides of the intricate system of alliances that made up Europe and caused World War 1.
what war?World War 1NovaNet: Germany invaded Belguim in order to march into Framce.
The German invasion of Poland on 1 September 1939.
A nation
Great Britain declared war on Germany in September 1939 after Germany invaded Poland.
They and Great Britain had committed to the defense of Poland.
Great Britain entered WWI because of the idea of collective security, where an attack on one country means an attack on all other countries in the alliance. Therefore, when Germany invaded Belgium, G.B declared war on Germany.
Great Britain entered World War 2 in 1939 after Germany invaded Poland.
Japan wasn't in WW1.
The British had promised the Belgians that they would support them if Germany attacked them. When Germany invaded Belgium, Britain declared war on Germany.
the catylist that caused America to enter world war two was the bombing of pearl harbour.
When Germany invaded Poland in 1939, France and Britain, who had promised aid to Poland if Germany invaded, entered the war on the Allied side, thus starting the Second World War.
yes, Britain entered the war at the beginning, the united Staes entered the war over two years later.