World war one started because of a couple of factors one was rival alliances, militarism, and nationalistic feelings. World war one started in Europe with their thoughts that France wanted revenge from the Prussian war. With Europe trying to keep peace Russia is setting up troops at its borders with Austria and Germany. All though the Russians set up there soldiers at their borders not long after Germany declares war on Russia and is quick to attack their allies France. Once Germany attacks France Great Britain declares war on Germany and at this point is where the nations start to side with one another which will eventually make the allied power and the central power for world war one . During the war there was a lot of new technology developed