Final answer:
The US dropping the atomic bomb added to the Cold War tension between the US and USSR by fueling the arms race, signaling the start of the Cold War, and raising concerns and mistrust between the two countries.
Step-by-step explanation:
The US dropping the atomic bomb added to the Cold War tension between the US and USSR in several ways. First, it created a nuclear arms race between the two superpowers. After the US dropped the atomic bomb, the Soviet Union quickly developed their own atomic bomb, and later, a hydrogen bomb. This arms race heightened the tension and increased the potential for nuclear conflict.
Second, the use of the atomic bomb by the US signaled the start of the Cold War and set the stage for future confrontations between the two countries. The Soviet Union saw the use of the atomic bomb as a demonstration of US power and a threat to their own security.
Lastly, the dropping of the atomic bomb on Japan without sufficient warning and the devastation it caused raised concerns and mistrust between the US and USSR. The Soviet Union questioned the motives and intentions of the US, which further added to the tension of the Cold War.