Why did both sides begin to develop new technology in WWI?

What happened at the battle of coleto? What were the 3 important battles turn the tide in World War 2? Which source of information is a primary source about trench wafare during world war 1? Most of the fighting on the western front took place in? What are the penalties of not registering for selective service? Who were neutral during world war 2? What are the names of fallen canadien soldiers that fought in World War 2? How is ultra and enigma the same in the world war 2? What is a command and conquer first decade codes? What was the role of the samurai? How many people died during the second battle of marne? When was Chopper City created? Did World War 1 start because of the nuclear race? What were the attitudes at the beginning of the war? What were the two sides of the battle of D-Day? What two types of government were in the rivalry of the cold war? How did d-day invasion contributed to the Allies victory in WW-II? What is the drainage channel called in a trench? Who were the different groups of people taking part in the war effort? What countries were anti-communist during th cold war?