Actually the Germans were on track to build the first atom bomb until many key scientists defected to the US/Great Britain. That enabled the US to create the first bomb and drop it in 1945 which led to the end of WW2.
Answer
The Nazis were nowhere near developing an atomic bomb, the "defecting" scientists mentioned above having left Germany well before WWII. Several were of course, Jews. The Manhattan Project was a joint Allied effort with scientists from many countries apart from the US including Britain, Germany, Hungary and Italy. A German, Klaus Fuchs, was a spy for the Russians which how they so quickly developed their own bomb (and why Stalin wasn't as surprised as he should have been when the Allies used their three bombs).
The US. The USSR stole our plans to make their first bombs.
Project Manhattan.
The Manhatten Project was the orginization that developed the atomic bomb.
officially - 1949 when USSR tested their first atomic bombactually - ~1944 when spies stole US atomic bomb plans and delivered them to the KGB
The atomic bomb was invented in 1933 (by Leo Szilard) and finally built in 1945 (by the US Manhattan Project, which involved hundreds of thousands of people). It was duplicated in 1949 (by the USSR, assisted by information from spies in the US project). It was already in "mass production" by both the US and USSR by the early 1950s , thus not invented by anyone in the 1950s.
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
The US. The USSR stole our plans to make their first bombs.
1949 thru 1950 prompted by USSR atomic bomb test.
He didn't care what the US officially informed the USSR about or not, he had spies that provided all the information about the atomic bomb he needed.
The United States
Project Manhattan.
The Manhatten Project was the orginization that developed the atomic bomb.
The US had the atomic bomb, whereas the Soviets did not.
I dont understand the question. why would America having the atomic bomb stop the USSR from spreading communism? Because if so it didn't. It spread to Cuba,Yugoslavia, North Korea, Plus parts of South Africa. While the US had the Atomic bomb.
The war against Germany was effectively won at the time the atomic bomb was developed, it would not have been politically expedient to explode such a weapon on mainland Europe.The US realised any future conflict was going to be with the USSR. The atomic bombs were dropped for political reasons, to show the USSR they had an awesome weapon.Political expediency is not always pleasant.
lack of trust of the USSR......................
The fear that Germany was already well on the way to building an atomic bomb and could make first use of them against either England or the USSR at any moment.