RussiaUS
America has the most nuclear weapons
126 Countries The most known is of course Russia (earlier sovjet) and USA :-) You probable mean Bio-Chemical weapons ;-)
Most did their own independent development.
USRussiaUKFranceChinaIndiaPakistanNorth Korea
"Arms Race"
Most countries have zero nuclear weapons.
Chemical weapons and DDT.
they dont make their own weapons they just buy them of other countries but most likely ak-47 is the most popular weapon in peru
An "arms race".
IR is called an "arms race".
The countries united in NATO. (They did so with the help of nuclear weapons because communist countries had surplus in conventional weapons.)