In the 1950s and 1960s it was always the US that had more.
In the 1950s the US had both the largest stockpile of bombs and the highest total megatonnage of yield.
US had up to an order of magnitude more nuclear weapons (or more) than USSR at all times in the 1950s.
From 1945 until the late 1970s or early 1980s the United States always had the most nuclear weapons. After then the USSR/Russia has had the most nuclear weapons.
The United States of America
The U.S. is first to have nuclear weapons, having nukes since 1945. The Soviet Union followed the U.S. by developing and testing their first nuke in 1949. Both nation started making hydrogen bombs (nukes using nuclear fission to explode) starting in the mid-1950s. Excuse me replying with a question, but were the Atomic bombs dropped on Japan in 1945 Nuclear weapons ? I am assuming they were, but do not know of the differentiation.
No Australia does not use nuclear weapons at this time. However Australia has had nuclear weapons tested within its borders.Australia does not have any nuclear weapons although there were several British tests at Maralinga, Emu field and Montebello Island in the 1950s. Australia has only 1 nuclear reactor at Lucas Heights near Sydney mainly for the production of useful isotopes.
No nuclear weapons from that era remain. The last MK-III bombs were recycled to make MK-4 or MK-5 bombs by the early 1950s.
the industrial Midwest
Project 'Manhattan' or to simply say, Nuclear Bombs and the US "Red Scare" in the early 1950s. from then on every country wanted nuclear weapons, And the First to acquire was the US, then Russia, then the United Kingdom, then France, then China, then India, then Pakistan, then North Korea. It is believed that Israel also has them, but they refuse to either confirm or deny. At the peak of the cold war arms race both the US and Russia had more than 10,000 strategic nuclear weapons and roughly 50,000 tactical nuclear weapons each, no other country in the world has ever had more than a few hundred total strategic and tactical nuclear weapons. As of 2014 both the US and Russia have reduced their stockpiles to about 3000 strategic nuclear weapons and zero tactical nuclear weapons (however the US maintains the parts from the dismantled 7000 strategic nuclear weapons and in an emergency could still reassemble them in a few months time into usable weapons, Russia likely has similar ability).
The US knew that if it used nuclear weapons, it might hurt the French
Both the US and USSR had deliverable nuclear weapons in the 10+ megaton range by 1955.
In the 1950s. Having nuclear weapons were the newest and most recent weapon for all countries. Aircraft where concluded to be the best transportation for the weapons because the easy drop on the areas of cities or countries.
This is completely unclear. However some military and political scholars suggest that without nuclear weapons a WW3 would likely have been fought in the mid to late 1950s.
Any country that decides to can. All they need is about four years to build the nuclear materials processing infrastructure and a few competent Physics Grad students to do the design and they can have fission bombs. Fusion bombs are somewhat more difficult, but modern PCs and freeware hydrodynamics/etc. software are far more capable then the computers of the 1950s when such devices were first built.
The USSR had developed a atomic bomb as well, so the US feared that they would be outnumbered in a nuclear war with the USSR
There probably would have been no cold war, but there probably would have been WW3, probably starting in early to mid 1950s.
fission bombs, fusion bombs, in the late 1950s "clean fusion" bombs. aerial bombs, artillery shells, missile warheads, you name it they did it. (the DOD did want nuclear hand grenades and mortar shells, but the labs didn't quite get them that small.)
it has been doing it since the 1950s
more bigger bombs
The development of intercontinental missiles in the 1950's made long range bombers obsolete. The intercontinental missiles were made for nuclear weapons.