After Hitler committed suicide on April 30, 1945, Berlin fell to the Soviets. Shortly after, Germany surrendered unconditionally on May 7.Source: United States Holocaust Memorial Museumhttps://www.ushmm.org/learn/timeline-of-events/1942-1945/german-forces-surrender-to-the-allies
Although President Harry S. Truman and General Secretary Joseph Stalin were allies in the second world war, neither of them trusted the other. They disagreed on which system to use and beliefs, despite this, they allied until the Cold War started in 1947.Source: https://www.history.com/topics/cold-war/cold-war-history
The Manhattan project was an American code-name for the project to make the controversial atomic bomb. Source: https://www.history.com/topics/world-war-ii/the-manhattan-project
The bombing of Hiroshima was the first of two bombings on Japan. Americans figured the only way to get the Japanese to surrender unconditionally was to invade their homeland. This bombing killed at least 80,000 people instantly.Source: https://www.nationalww2museum.org/war/articles/atomic-bomb-hiroshima
The bombing of Nagasaki is the second bombing and the most controversial. This bomb was about 40% more powerful than the one dropped on Hiroshima. As a direct result of the bomb over 5 years, over 100,000 deaths occurred.Source: https://www.nationalww2museum.org/war/articles/bombing-nagasaki-august-9-1945
Japan surrendered officially on September 2, 1945. The Soviets overwhelmed their forces to begin with, and after the United States dropped 2 bombs on them, they agreed to unconditionally surrender.Source: https://www.history.com/this-day-in-history/japan-surrenders