There were really not nations but alliances the Allies and The Central powers and both sides used them....
Chemical weapons, chemical weapons, and more chemical weapons
in world war 1 Germany introduced the use of chemical weapons for instance the Mustard Gas artillery shells, theses weapons where mainly used by countries on there side.
Chemical weapons are used all over the world to kill insects. A LOT of insecticides are, in fact, nerve agents. (Keep this in mind if you need to test your chemical agent alarm: just squirt a little Raid on it and it'll start screaming.)
chemical weapons could kill or cause seriouse perminate injuries
In World War I the Germans used phosgene and chlorine gases on their enemies. During the Iran-Iraq War, Iraq used chemical weapons on the Kurds in Halabja.
Nuclear weapons, Biological Weapons, Chemical Weapons.
Because they worked so well in World War I.
Automatic weapons, new tactics, airplanes, tanks, trenches, chemical weaponry.
i think using chemical weapons in war is not the best idea in the world but if that is all we have to use then i guess we will use it. but i also think that creating a way to kill our enemies without our weapons hurting our soldiers sould be made.
Chemical weapons were first used in war by Germany in WW1.Nuclear weapons were first used in war by the US in WW2.
Chemical weapons are very dangerous and can destroy also the environmement; USA used chemical weapons in all the wars (Vietnam, Serbia, Irak, Afghanistan, etc.).
Chemical weapons are a reality.