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At the end of WW2 the United States and Soviet Union were the two most powerful military forces on the planet. period.

The Soviet Union prior to outbreak of hostilities and invasion by Germany as early as 1939' through 1941' had moved it's industrial base especially it's oil refining and heavy industry such as steel production out of reach of the Germans, untouched and functioning during after WW2.

The Soviet Union did not get majority of raw materials from the United States and had plenty of resources , oil, natural gas, steel and especially strategic metals such as titanium . Roughly 90% of the worlds titanium resources are located in the Soviet Union. Especially useful for high tech aircraft construction.

The Soviet Union after VE-Day WW2 included all the satellite states of eastern europe including 1/2 Germany all of Berlin, etc. including all the industrial resources of same countrys. Also known as the ( Warsaw Pact ).
Further sources of uranium used for early Soviet Union nuclear bomb program - were located in mines in East Germany

Most importantly it had a standing army on the doorstep of western europe.

The United States although temporarily ahead in nuclear technology on paper, it's entire nuclear arsenal had been totally used up in WW2 against Japan - a total of 2 nuclear bombs had been expended.
( not counting the test device used at Los Alamos, New Mexico.)

The first in Europe Soviet nuclear reactor F-1 (nuclear chain reaction was initiated on December 25, 1946) . And the first Soviet bomb was detonated in 1949'.

The United States and the Soviet Union after WW2 would face off against each other for several decades in a epic struggle known as the 'Cold War'.