Britain entered World War I in 1914 to honor a treaty that promised to defend Belgium and to fulfill an alliance with France and Russia. The Germans attacked Liege, Belgium, in the first battle of World War I, and then marched on to attack France.
I'm assuming by "war" you mean World War I
Representative democracy .modern nations including the united states have too many people for a direct democracy.
It's 3. After fighting in the revolutionary war, most of the founding fathers agreed that they wanted to step as far away from a strong ventral government since that's what they tried to escape in the first place. this then leads up to the 2nd continental congress being so weak, they can only advise the completely sovereign states from making bad decisions. otherwise known as the articles of confederation for when it gave full state power to basically act as if they were they're own nation.
The Pullman strike was caused by the panic of 1893, George Pullman, which increased hours for working and they cut down wages.
Hopefully this will help someone out! :)