germany
Nobody knows
A massive offensive attack by the Allies in 1918, where the Allies were able to overpower the German trenches.
There were 1.5 million volunteer army guards that were the alternative defense if Nazis or their allies tried to attack the country of Britain and major factories.
America's support of the allies led Hitler to attack American ships.
If country A attacks country B, then A's allies also attack country B, and B's allies all come to the defense of B.
germany
It was the assassination of the Romanian duke that encouraged Romanians to join the allies to fight for freedom. Romania was a country controlled by Austria-Hungary at that time.
It was good for a country to have allies because the allies would help your country out with war or rescourses
china
French and Indians were allies. Colonists and British were allies.
Nobody knows
Desert Storm
The allies took away Germany's army because they were afraid that Hitler might attack them.
the allies wanted to capture gallipoli so they could get supplies to the Russians
No country attacked the US before they joined WW1, but the US's allies such as France and Britain were attacked and at war with Germany, so the US decided to support their allies and join the war. The sinking of the British/ American ship "The Lusitania" was a trigger for the US to join the war.
The Allies first landed in Libya, then later in Italy.