The idea for a technologically feasible atomic bomb originated in Nazi Germany, but the first operational atomic weapon was created in the United States during the Manhattan Project.
The Germans were the ones who first researched and developed the concept of a practical atomic weapon. Later people said the USA invented nuclear (hydrogen) weapons using German scientists captured near the end of WW2. Some also claim the US won the war while ignoring the efforts, cost to, and sufferings of the USSR.
About the same time the USSR had their own nuclear weapons program, but it hadn't advanced very far until they received information from American spies, the Rosenbergs and Fuchs. Also there's great debate over who first effectively utilized the Teller-Ulam concept to develop practical hydrogen bombs. Later in the Cold War the USA and the USSR argued over who was the stronger superpower. By 1985 the USSR had the biggest army and stockpile of atomic weapons in the world.
Also, it's interesting to note that there's creditable evidence to believe that during WWII Japan developed and tested an atomic device in what's now N. Korea. It's known that a German submarine, the U-224, was carrying nuclear material for Japan's nuclear weapons program efforts.
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 United States of America was the country that developed the first nuclear weapons.
An amount of nuclear weapons a country has
A country's stance on nuclear weapons or if they have any.
The US was the first to start testing nuclear weapons
The first Islamic country to have nuclear weapons was Pakistan.
Number of nuclear weapons by country: Country # of nuclear weapons USA 10'300 Russia 16'000 China 410 France 350
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The US tested nuclear weapons on its own territory including the deserts of the continental southwest US.
The new country that want to make nuclear weapons. And how to consult with they own weapons
It really depends on what country owns the nuclear weapons, if your country owns them, then the only thing you have to worry about is that it will go off by accident (Completely unlikely). But if it is an enemy country that owns them you have to watch out for nuclear attacks.
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US