Like Italy and Germany, Japan made their own...they had to in order to supply them with parts and ammunition. Great Britain and the USSR (Russia) used American-made weapons...to include warships, airplanes, tanks, machinguns, and rifles.
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Not entirely. Both GB and the USSR built huge quantities of arms for themselves..
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Nuclear weapons have only been used in combat on Japan.
I believe Japan surrendered because we threatened them with nuclear weapons.
Japan
Weapons of mass destruction have never been used against the US. In fact, the US is the only country that has ever used an atomic bomb against another country and that was Japan during the second World War.
There have been two nuclear weapons detonated as offensive weapons during war. Both nuclear bombs were dropped by the United States on Japan near the end of World War II. The first nuclear weapon (code named "Little Boy") was detonated on August 6, 1945 over Hiroshima, Japan. The second (code named "Fat Man") was on August 9, 1945 over Nagasaki, Japan. The destruction was so horrific, that the fact of the destruction has served as a deterrent to the use of nuclear weapons ever since.