The Franz Ferdinand assassination<span> was </span>not<span> the </span>cause<span> of war. Tensions between the Great Powers of Europe had been rising gradually since the beginning of the 20</span>th<span> century </span>and<span> it </span>is<span> entirely feasible that a Great War would have taken place had the Archduke </span>not<span> been murdered.</span>
The answer is gold, usually.
It was The Virginia Plan.
The Virginia Plan: Two-house Congress with each state's representation based on state population.
vs.
New Jersey Plan: One-house Congress in which each state had equal representation.
From the perspective of France, the Congress of Vienna's decisions were not fair. France lost almost all of the land it had gained during the Napoleonic Wars. As a result, it was put at a disadvantage.