One important change that occurred by the end of World War I was the advancing of technology and weapons. Major armies had become more modernized and were making advanced weapons. They created wireless communicators, armored cars, tanks and aircraft as well as machine guns. They have also incorporated telephone use into their daily lives. Gas masks were also created because of the use of dangerous gases of chlorine, mustard gas and phosgene. U-boats (submarines), blimps and hydrophones were also used for the war

Which country had the most advance technology/weapon?

Which country had the least advance technology/weapon?