Austria-Hungary's declaration of war set in motion the full scale conflict we know as WW1. Triggering the alliance system, it lead to Russia's mobilisation on Germany, Austro-Hungarian borders; Germany's declaration of war on Russia then France. All of these major European nations ready for battle, needed no time to prepare their forces. Great Britain's involvement came when Germany invaded Belgium. Decades of nationalism, building navy's, and expanding territory started to spill out to the world. In the end it left the old powers Great Britain and Germany weak and a new super power arise - America.