There have already been some good posts, however if i read this:
Well let me re-phrase that, yes the Balkan states were spoiling for a fight. But Germany was the only major power that wanted a war. Russia didn't, France didn't, Britain didn't, Italy didn't. Germany was the primary factor in turning a regional conflict into a world war. IMO.
i have to answer !
"Germany was the only major power who wanted a war" ? Both France and Russia wanted to kick Germany, as you can read in original documents when the ambassadors of France and Russia in St. Petersburg had met and agreed to "...meet again 'unter den Linden' in Berlin, before the year's end ...". This was on New Year's eve 1914, and it was even written down.
It is also knwon that Germany had asked Belgium for an allowance to march through, something that a neutral country certainly could not do.
On the other hand Belgium was not exactly neutral or harmless, when it came to its colonies. History reports 40 million african civilian deaths in the Congo, due to belgian King Leopold 'the slaughterer', who ran the colony as a private enterprise. Rhodes in his privately owned 'Rhodesia' was 'benevolent', in comparison (*hrrrm* lmao).
Germany had the choice of going through Belgium first, or waiting to be attacked from both sides, Russia and France. France was a bit more eager than Russia though, thinking of Napoleon I through III, but they sure had an axe to grind.
Interestingly, the original French plans included invading Germany through Belgium as well, but as things went they came a bit too late.
As Niall Ferguson points out in 'The pity of war', England would have invaded Belgium as well. B.t.w. they had held manoeuvers in 1907, simulating landing military in Belgium, across the channel.
Italy wanted to get big chunks of the toppling austro-hungarian Empire, and had the least reason to enter the war, if you blind out good old imperial greed. Venice was not always italian, you know.
As someone else put it, harsh but true:
" ... Germans had the choice of going through Belgium first, or waiting for a simultanous invasion from Russia and France. Belgs had a choice of granting Germans passage and being invaded by Britons or French, or refusing passage and being invaded by Germans. French had the choice of keeping peace and letting Germans mind their business, or assembling an international anti-German coalition, plan, and then execute a world war over a previous conflict (which France had started, too, and duly lost). Britons had the choice of informing Germans they were going to back France in the case of war (which could prevent the war) or feign neutrality until Germans committed to war with the French (which would ensure Germans stumble into an unwinnnable war). But sure, let's blame Germans for using every promising strategy when fighting for survival, they should have lain belly up and accept the Versailles treaty without a fight. ..."
The book 'The sleepwalkers' is not quite as harsh, but comes to a similar conclusion.
Germany was not shy of fighting, but it found itself in a war intended by Russia and France. I guess we will all be astonished if those archives will be really opened, after a hundred years. I doubt the latter though.