WWI saw the deployment of modern armored tanks, barbed wire, poison gas and machine guns.
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Atomic BombsNapalm BombsImproved fire weapons both troop size and on tanksJetsNewer and bigger planes and bomber planesRadar (not a weapon but aided the war)SONAR (improved from WW1)Missiles (self flying bombs like Hitler used on England)The Germans introduced a lot of new weapons but the list is long.The Japanese introduced the concept of suicide bombing
This is an impossible question to answer fully without writing a book (see Campbell's "Naval Weapons of World War II). In summary, anything and everything was used. here's a list of headings: guns (incl dual-purpose, anti-aircraft, cannon, machine guns), torpedoes, depth charges, mortars, rockets, aircraft, bombs, mines, explosive boats, suicide weapons ..... You also need to consider detection and targetting with optical, acoustic and radar devices.
Israel, America, Russia, China... that's all i can think of on the top of my head. Others that are "internationally allowed" to have nuclear weapons (approved by IAEA) would be France, and England, that I know of. I do not believe Israel is on that list.
i think you need to be more specific there there have been numerous weapons made since 1945 long range missiles top the list Jets are also a major step after the 2nd great war
Yes, it is an extremely long list. It can be found on the internet.