BooNZ
Banned
Serbia is primary -- its secret police supported a terrorist group and failed to control them
Austria is most definitely second
Russia is third, as it did not have to mobilize (it chose to protect its little Orthodox brother, but it didn't have to)
Germany is fourth, as it did indeed invade Belgium and definitely didn't have to do that, and it could have pressured the Austrians to find a less drastic course when it became clear that Russia was going to mobilize
France and Britain share little responsibility for this Guns of August although France could have made it clear to Russia that it would not support mobilization over Serbia (and thus inevitable war with Germany)
of the powers at war in August 1914, the British share the least responsibility, having done everything it could to make it clear that invading Belgium meant war. The only really innocent power is Belgium, who got invaded merely because they were in the way (and of course little Luxembourg, they too were speed bumps in the road to France, but at least Luxembourg didn't suffer much for it)
Mostly agree with the above, except for the following:
It was not entirely clear to anyone the invasion of Belgium meant Britain would enter the war - or conversely, that Britain would otherwise not get involved. France had armed and financed a rogue state leading into the war and together with Russia effectively gave that rogue state a blank cheque following the assassination.