Here are some of the weapons first used in WWI. Airplanes, Derigables, poison gas, flamethrower, and tanks. Other weapons that were invented before the war but not used on a wide scale or were not reliable until WWI were the machine gun, submarines, torpedoes, small mortars and very large caliber artillery. WWI also saw the use of the radio for the first time in combat conditions.
<span>Kings at the time usually didn't have heirs to the throne, because of this by killing the king you bring confusion to the country. No one knows what to do and everyone wants to be the new leader. So the king dying was a great chance for Alexander to take over Persia.</span>
We had the Cold War. It was called the Cold War because no military force was used in the war. It was mainly a technology race to try and scare the other country and come out superior. Espionage was also used in the war, but there was no man on man combat, and war with atomic/nuclear weapons was not conducted. I hope that answered your question, my friend.
