Here are all of the reasons :)
Russia protected Serbia because it is her traditional ally.
So When Russia placed its troops to surround the Austrian borders they were very close to the German borders.
Because Germany was led by a hectic ruler he accused Russia of planning to attack Germany and in addition Germany and Austria are traditional allies and therefore Germany had to step down and protect itself.
-DK
Germany's urge to control all of Europe.
Germany attacked Poland, which had pacts with France and England, who declared war on Germany. Obviously it is a lot more complicated then this, but this is the basic answer to how the war began.
the reason was the Germans did not leave Poland so they had to declare war on Germany otherwise the Germans would attack us and take over us.
the reason is because Germany were jealous because Britain and France had much empires than them. so this jealousy grew up and made Germany join in the war.
They wanted to destroy all
America declaring war on Nazi Germany and joining the Second World War in Europe.
Germany
I think it is because Germany wanted war.
No. Its reason for joining the War is because the three ships that were, sank shot by Germany as they used the illegal power (unrestricted submarine warfare). Alvin Saptauli
Germany wanted world domination.
In both WW1 and WW2, Australia and New Zealand supported Britains war with Germany and sent Anzac forces as part of their support.
he blamed them for the reason Germany lost world war 1 and Germany's economic
allied powers & every country had its own reason for joining the war
Germany invaded Poland
The Allies treated Germany very harshly with the treaty. After World War 1 Germany was in economical crisis. If the Allies would have helped Germany after the war maybe Adolf Hitler would never have a reason to start World War 2
The more important reason for Britain joining World War 1 was the Schlieffen Plan, that Germany had written up. The plan involved Germany attacking on two fronts; Russia and France. Almost immediately this would of set sparks off within the Triple Entente; Great Britain, Russia and France. The biggest fault of the plan was that Germany would have to go through Belgium to attack France. In 1839, Britain signed a treaty with France stating that they would help Belgium, who were neutral, if they were ever invaded. With Germany wanting to pass through Belgium, Britain were forced to declare war on Germany, something which the Germans had not expected at all. If Britain had left it, essentially Germany would of invaded both France and Belgium, and then would of been able to invade Britain from the South. Germany could of won World War One if Great Britain didn't attack.
When they were attacked by Germany. Very bad choice for Germany.