USA HISTORY

Detailed explanation-1: -"The war is won, ” he said in December 1945, “but the peace is not.” The development of the atomic bomb and the subsequent arms race between the United States and the Soviet Union ushered in a new conflict: the Cold War.

Detailed explanation-2: -The nuclear arms race was perhaps the most alarming feature of the Cold War competition between the United States and Soviet Union. Over the decades, the two sides signed various arms control agreements as a means to manage their rivalry and limit the risk of nuclear war.

Detailed explanation-3: -’Little Boy’ Bomb Dropped on Hiroshima Then on August 8, Soviet forces invaded Japanese-occupied Manchuria, violating an earlier non-aggression pact signed with Japan.

Detailed explanation-4: -Years ahead of what Americans thought possible, the Soviets had exploded a nuclear device. Truman reacted by requesting an intensive re-evaluation of America’s Cold War policies by the National Security Council.

Detailed explanation-5: -But the American monopoly on the atom bomb ended in 1949 as the Soviet Union tested its first nuclear weapon. As the USSR and US shifted from World War allies to Cold War enemies, an arms race to develop the most and best nuclear weapons defined their relationship. The nuclear arms race accelerated quickly.