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The nuclear weapons of the cold war still exist. They were in responsible controlled hands during the cold war (which is why there wasn't a war). The problem: Keeping them out of un-controlled hands.
Because today, people have much more greater ideas and know how they can improve weapons.
Some are
the creation of the nuclear weapons because that made everyone fear us(u.s) hence the cold war and the race for the creation of more nuclear weapons and it affects us 2 this day because everyone is always fearing a nuclear holocaust
Weapons that are still used today that have been around the longest are probably the rifle followed by the cannon. Weapons that had the longest use but are obsolete today are the spear (and maybe the ax) followed by the bow and arrow. The spear is surly the earliest weapon. It became the lance which was in use as late as World War 1
M1-Garand is used in Vietnam. And thats about it.
You're question is not clear. If you mean last used during World War II, it is Nagasaki on August 9, 1945. If not, atomic weapons are still used today.
Two nuclear weapons ended World War 2.
veterans
Different weapons? The war today wasn't started by Archduke Franz Ferdinand's body.
All countries fighting in World War 2 used weapons.
It was a war.