Why did tension between the US and Soviet Union start to
build during the end of WWII?

Answer:

See Explanation after viewing:

At the end of WWII, the USSR and the United States were prospering enough and had gained enough power to become world powers. Due to the countries both being new formidable world powers, the competitiveness increased. This means that they were always aiming to reach a goal before the other did such as who would make it to the moon first. The Cold War was the war where there was a ideological and political war between Russia and the United States.

Explanation:

Throughout World War II, tensions between the United States and its unlikely ally, the Soviet Union, continued. The first nonaggression deal between Soviet Premier Joseph Stalin and Adolf Hitler in 1939 was not forgotten by Western Allied leaders. However, following Germany's invasion of the Soviet Union and Japan's attack on Pearl Harbor, the USSR and the US formed an alliance. As the United States and the Soviet Union were turned into powerful international powers as a result of World War II, competition between the two grew. Following the fall of the Axis forces, the US and the USSR developed an ideological and political competition that ushered in the Cold War. The following competition for superior military might ushered in a period of espionage, battles over communism's rise, and the development of nuclear weapons that threatened global devastation. While President Roosevelt anticipated that the postwar international order would bring durable peace, ties with the Soviet Union hampered that goal. The expansion of communism outside Russia has been a constant threat throughout the twentieth century, since before the Bolshevik Revolution in 1917, when the Russian monarchy succumbed to Soviet armies. This anxiety was justified, since Soviet officials actively attempted to infiltrate or attack countries in order to expand the USSR's global influence. The following competition for superior military might ushered in a period of espionage, battles over communism's rise, and the development of nuclear weapons that threatened global devastation. While President Roosevelt anticipated that the postwar international order would bring durable peace, ties with the Soviet Union hampered that goal. The expansion of communism outside Russia has been a constant threat throughout the twentieth century, since before the Bolshevik Revolution in 1917, when the Russian monarchy succumbed to Soviet armies.This anxiety was justified, since Soviet officials actively attempted to infiltrate or attack countries in order to expand the USSR's global influence. Following Germany's surrender, Soviet efforts to seize territory in Europe fueled speculation that the USSR wanted to spread communism over Europe. By 1947, the US had developed a containment policy to limit Soviet worldwide hegemony. In President Harry Truman's administration, this became a defining feature of foreign policy. What became known as the Truman Doctrine was outlined in a speech to Congress as an open commitment of US help to any country endangered by the Soviet Union. This commitment was kept during Truman's presidency and sustained in subsequent administrations.The "domino theory," which suggested that if one nation fell to Communism, the neighboring countries were likely to succumb as well, was inspired by the containment policy. As a result of this strategy, the US was forced to engage hostilities in Korea, Vietnam, and other Cold War conflicts. Mutual efforts to destabilize their adversary prompted the US and Soviet administrations to place spies in both the USSR and the US to sabotage policy, spy on intelligence, and find ways to thwart any attempt to expand worldwide influence. While popular depictions of Cold War-era spies depict high-stakes operations, assassinations, and concealed recording devices that conjure up thoughts of James Bond, these photos are based on real-life espionage. In the 1950s and 1960s, several similar devices appeared, including poisoned pellets hidden in umbrellas and firearms disguised as lipstick tubes. However, acts of espionage between the US and the USSR existed from the beginning of the Cold War. Initially, Soviet espionage was focused on collecting knowledge on nuclear weapons development. The Trinity test, in which the US exploded a nuclear weapon for the first time, and the following deployment of two atomic bombs on Japan, delivered a clear statement to the world that the US possessed the most powerful weapons on the planet. This gave the US an indisputable advantage over other countries, prompting the USSR to develop its own nuclear technology.

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